Monday

January 23, 2017
Number of results: 75,920

**physics**

Suppose that you wish to fabricate a uniform wire out of 0.900 g of copper. Assume the wire has a resistance R = 0.500 , and all of the copper is used. (a) What will be the length of the wire? (m) (b) What will be the diameter of the wire? (µm)

*September 17, 2010 by lynette*

**physics**

A copper wire that has a diameter of 2.9 mm carries a current of 39.0 A. Assuming that each copper atom contributes one free electron to the metal, find the drift velocity of the electrons in the wire. The molar mass of copper is 63.5 g/mol and the density of copper is 8.95 g/...

*July 6, 2016 by Joe*

**physics**

a copper wire with a diameter of 1.5mm is joined to an aluminium wire which has a diameter of 2.3mm.the wire carries a current of 12A.what is the current density in each wire

*February 18, 2016 by mat*

**Physics**

You've made the finals of the Science Olympics! As one of your tasks, you're given 1.8g of copper and asked to make a wire, using all the metal, with a resistance of 1.3 Ohm. Copper has a density of 8900 kg/m^3. What length will you choose for your wire(in meters)? What ...

*February 17, 2010 by Anthony*

**Physics**

1) Suppose that you wish to fabricate a uniform wire out of 1.15 g of copper. Assume the wire has a resistance R = 0.600 , and all of the copper is used. (a) What will be the length of the wire? m? (b) What will be the diameter of the wire? µm? 2) A rectangular block of ...

*October 4, 2010 by Max*

**Physics**

1) Suppose that you wish to fabricate a uniform wire out of 1.15 g of copper. Assume the wire has a resistance R = 0.600 , and all of the copper is used. (a) What will be the length of the wire? m? (b) What will be the diameter of the wire? µm? 2) A rectangular block of ...

*October 4, 2010 by Tommy*

**Physics**

A copper wire of diameter 0.30mm and length 1.50m is joined to another steel wire of same diameter and length 1.20m. The copper part of the double wire is hung vertically to a fixed point, while a small weight is connected to the lower end of the steel part. Joining the two ...

*October 31, 2013 by Cali*

**physics**

copper has 8.5 x 10^28 electrons per cubic meter. (a) how many electrons are there in 30 cm length a 12 gauge copper wire (diameter 2.05 mm)? (b) if a current of 1.55 A is flowing in the wire, what is the average drift speed of the electrons along the wire? (There are 6.24 x ...

*October 8, 2012 by jewel*

**Physics**

Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L1 and wire 2 has length L2, how do L1 and L2 compare if wire 1 is made from copper and wire 2 is made from aluminum? The resistivity of copper is 1.7 × 10-5Ω·m and the...

*October 15, 2010 by Max*

**college physics**

A 4m long copper wire has a diameter of 2mm and carries a current of 10A. Determine the ff: a. current density in the wire b. electric field c. potential difference between the ends of the wire d. resistance of the wire

*February 25, 2013 by Zell*

**Chemistry**

If the copper is drawn into wire whose diameter is 9.50 , how many feet of copper can be obtained from the ingot? The density of copper is 8.94 . (Assume that the wire is a cylinder whose volume is , where is its radius and is its height or length.)

*August 31, 2011 by Okoye*

**physics**

With a magnetic field perpendicular to a single 13.2 cm diameter circular loop of copper wire decreases uniformly from .670 T to zero. If the wire is 2.25 mm in diameter how much charge moves past a point in the coil during this operation?

*April 28, 2014 by jon*

**University Physics**

A hollow copper wire with an inner diameter of 0.60mm and an outer diameter of 1.8mm carries a current of 15A. What is the current density in the wire?

*March 22, 2013 by Wolf*

**Physics**

What length of #22 B&S gauge copper wire is needed to make a resistance of 500 ohms? This is what I came up with but don't think it is correct. looked up diameter for #22 gauge wire = .643 mm and converted to m 6.46 * 10^-4. Used Eq. A = (pi)(d^2)/4 => A = (pi)(6.43 * 10^-4...

*September 7, 2012 by Kevin*

**Physics**

A long horizontal wire carries a current of 48A . A second wire, made of 2.6mm diameter copper wire and parallel to the first, is kept in suspension magnetically 15cm below(Figure 1) . Determine the magnitude of the current in the lower wire.

*April 8, 2013 by bud*

**physics**

A long horizontal wire carries a current of 48A . A second wire, made of 2.6mm diameter copper wire and parallel to the first, is kept in suspension magnetically 15cm below(Figure 1) . Determine the magnitude of the current in the lower wire.

*April 8, 2013 by bud*

**maths**

A copper solid cylinder of radius 14 cm and height 10cm is meter and recast into cylindrical wire of diameter 4mm.find the length of copper wire?

*March 21, 2015 by om*

**Math**

A copper solid cylinder of radius 14cm and height 10cm is melted and recast into cylindrical wire of diameter 4mm.find the length of the copper wire

*December 29, 2016 by Anonymous*

**physics**

A 15 ohm resistor is made from a copper wire of mass 14.2 grams. What is the wire's diameter and length?

*March 4, 2013 by lindsey*

**physics**

. A copper wire 1.00 mm in diameter is used to support a mass of 6.0 kg. If the wire was stretched by 2.00 mm, what was the original length of the wire? Y = stress/ strain r= 0.5 mm =5 X 10-4 m e= 2mm or 2 X 10-3 Given : m = 6 kg F = 60 N A =π r2 = ( 3.14)( 5 X 10-4) (5 X...

*March 19, 2015 by arlene*

**Physics**

A 14.0 ohm resistor is made from a coil of copper wire whose total mass is 23.0 g. What is the diameter of the wire, and how long is it?

*February 6, 2011 by George*

**physics!**

A copper wire 81.9 cm long and 1.10 mm in diameter has a mass of 6.43 g. (a) Find the number of electrons in the wire. (Copper has an atomic number of 29; that is, there are 29 protons in the Copper atom. Copper's atomic mass is 63.5.) how many electrons: (b) There is one free...

*September 19, 2011 by austin*

**physics**

A copper wire 81.9 cm long and 1.10 mm in diameter has a mass of 6.43 g. (a) Find the number of electrons in the wire. (Copper has an atomic number of 29; that is, there are 29 protons in the Copper atom. Copper's atomic mass is 63.5.) how many electrons: (b) There is one free...

*September 19, 2011 by austin*

**physics**

What is the resistance of a 7.4-m length of copper wire 1.2mm in diameter? The resistivity of copper is 1.68×10−8Ω⋅m. R=_________

*February 7, 2014 by IM*

**Roper**

You've made the finals of the Science Olympics! As one of your tasks, you're given 1.1 g of copper and asked to make a wire, using all the metal, with a resistance of 2.0 (ohms). Copper has a density of 8900 kg/m^3. What length will you choose for your wire? What diameter will...

*March 24, 2011 by Daniela*

**Physics**

Suppose a straight 1.60mm -diameter copper wire could just "float" horizontally in air because of the force due to the Earth's magnetic field B⃗ , which is horizontal, perpendicular to the wire, and of magnitude 4.2×10−5T . What current would the wire carry?

*February 22, 2014 by Anonymous*

**Physics**

What is the mass of a copper wire that will give a wire, 0.20mm in diameter, a resistance of 400 ohms can you please show me the formulas

*November 25, 2015 by John*

**Physics**

You've made the finals of the Science Olympics! As one of your tasks, you're given 1.1g of copper and asked to make a cylindrical wire, using all the metal, with a resistance of 1.7 Ohm. What length l will you choose for your wire? What diameter d will you choose for your wire?

*February 17, 2010 by Anthony*

**chemistry stoichiometry**

My chem teacher gave us this problem Twelve-gauge copper wire,like the kind commonly used in residential electrical systems, is roughly cylindrical and has a diameter of approximately .1040in. Copper's density is 8.92g/cubic cm and copper atoms have an approximate atomic ...

*September 9, 2007 by Julissa*

**Physics**

A straight copper wire that is 1 milimeter in diameter carries a current of 20 miliamps. Whas the magnitude of the largest magnetic field created by this wire in Tesla?

*December 12, 2013 by Anonymous*

**physics**

A straight copper wire that is 1 milimeter in diameter carries a current of 20 miliamps. Whas the magnitude of the largest magnetic field created by this wire in Tesla?

*December 18, 2013 by akameno*

**physics**

A copper wire has a circular cross section with a radius of 3.75 mm. If the wire carries a current of 4.00 A, find the drift speed of the electrons in the wire. (Assume the density of charge carriers (electrons) in a copper wire is n = 8.46 *10^28 electrons/m^3.) thanks

*March 27, 2011 by Rachel*

**physics**

A copper wire has a circular cross section with a radius of 3.75 mm. If the wire carries a current of 4.00 A, find the drift speed of the electrons in the wire. (Assume the density of charge carriers (electrons) in a copper wire is n = 8.46 *10^28 electrons/m^3.) thanks

*March 27, 2011 by Rachel*

**College Physics II**

A steel wire and a copper wire, each of diameter 2.000 mm, are joined end to end. At 48.0°C, each has an unstretched length of 2.000 m. The wires are connected between two fixed supports 4.000 m apart on a tabletop. The steel wire extends from x = −2.000 m to x = 0, the...

*September 3, 2013 by Andrew*

**physics**

a Coper wire with wire with a diameter of 1.5mm is joined to an alluminium wire, which has a diameter of 2.3mm. The wire carries a current of 1.2A. What is the current density in each wire?

*December 26, 2016 by lid*

**physics**

the resistance of copper wire of length 1m is 0.1 ohm the diameter of the wire is 0.045cm find its specific resistance

*March 5, 2013 by amit kumar*

**physics**

a copper wire has a diameter of o.5mm and resistivity of 1.6*10power 6 ohm cm.calculate the length of wire which will be necessary to make 10 ohm coil

*June 16, 2014 by kanika*

**Physics**

A length of copper wire is shaped into a single circular loop of circumference 63 cm, similar to that shown in the picture below. A magnetic field of strength 0.50 T is parallel to the normal of the loop. The copper wire has a resistance of 2.5 x 10-2 Ω. The ends of the ...

*August 14, 2015 by Andrew*

**college physics**

How to do this problem? Compute the number of turns of wire on a coil whose resistance measures 15.5 ohms, and which is wound around a 2-inch diameter form in a single layer of 28 gage enameled copper wire.

*April 4, 2010 by Mike*

**Physics**

You need to make a 100 microH inductor on a cylinder that is 5.0 cm long and 1.0 cm in diameter. You plan to wrap four layers of wire around the cylinder. What diameter wire should you use if the coils are tightly wound with no space between them? The wire diameter will be ...

*April 13, 2008 by Jill*

**Physics**

A current of 4 A flows in a copper wire 10 mm in diameter. The density of valence electrons in copper is roughly 9 × 1028 m−3. Find the drift speed of these electrons. Answer in units of m/s.

*November 1, 2012 by Aj*

**Physics**

Suppose that you wish to fabricate a uniform wire out of 1 g of copper. (Resistivity = 1.72*10^-8 Ohm-m, density = 8.94*10^3kg/m^3). If the wire is to have a resistance of R = 0.5 ohm and all of the copper is to be used, how long is the wire? a. 1765 m b. 1816 m c. 1.8 m d. 0....

*March 1, 2013 by John*

**Physics**

A copper wire has a resistance of 24 Ω at 20°C. An aluminum wire has three times the length and twice the radius of the copper wire. The resistivity of copper is 0.6 times that of aluminum. Both Al and Cu have temperature coefficients of resistivity of 0.004°C–1. What...

*November 17, 2010 by Trace*

**physics**

What is the resistance of a 2.5 m length of copper wire 1.3 mm in diameter?

*February 15, 2011 by michelle*

**Physics 212**

Two copper wires have equal lengths, but the diameter of one is three times that of the other. a) The resistance of the thinner wire is _____ times that of the thicker wire: (Prove your work) 1) 3 2) 1/3 3) 9 4) 1/4

*January 6, 2014 by Marcu*

**Physics**

You have a piece of copper with a volume of 2 cm3, and wish to form a wire having a resistance of 0.15 ƒ¶. How long should the wire be if the resistivity of copper is 1.72 ~ 10-8 ƒ¶. m?

*July 15, 2013 by tom*

**Physics**

What is the resistance of a 4.00 m length of copper wire having a diameter of 2.00 mm at a temperature of 20 degrees?

*May 10, 2011 by Anonymous*

**Physics**

(1) 45 micro coulombs of charge is passed through a wire in 35 seconds. How many electrons does this represent? What is the current in the wire? (2) A piece of copper wire has a resistance of 5 Ohms at 20 degrees celsius. If another piece of copper wire at 0 degrees celsius is...

*May 4, 2009 by Bob*

**magnetism**

A straight copper wire that is 1 millimeter in diameter carries a current of 20 milliamps. What the magnitude of the largest magnetic field created by this wire in Tesla?

*December 18, 2013 by Hans*

**Chemistry 101**

A 16 Gauge wire has a diameter of 0.0508 inch. Calculate the length in meters of a 5.00 pound spool of this wire. The density of copper is 8.92g cm^-3

*January 17, 2016 by Scott L*

**Physics**

A wire is supposed to be 0.10 millimeter in diameter. Laser light of wavelength 670 nm shining onto the wire creates a diffraction pattern on a wall that is 4.5 meters behind the wire. The central maximum of that diffraction pattern is 6.3 centimeters wide. What is the ...

*June 1, 2016 by ?*

**Physics**

Suppose a straight 1.25 mm diameter copper wire could just "float" horizontally in air because of the force of the Earth's magnetic field B, which is horizontal, perpendicular to the wire, and of magnitude 5.00 multiplied by 10-5 T. What current would the wire carry? I want to...

*February 10, 2011 by Justin*

**Chemistry**

Earth's oceans have an average depth of 3800 m, a total area of 3.63 108 km2, and an average concentration of dissolved gold of 5.8 10-9 g/L. (a) How many grams of gold are in the oceans? (b) How many cubic meters of gold are in the oceans? Assuming the price of gold is $392....

*August 25, 2013 by Anonymous*

**magnets**

A straight copper wire that is 1 milimeter in diameter carries a current of 20 miliamps. Whats the magnitude of the largest magnetic field created by this wire in Tesla?

*December 18, 2013 by anton*

**magnetism!!**

A straight copper wire that is 1 milimeter in diameter carries a current of 20 miliamps. Whas the magnitude of the largest magnetic field created by this wire in Tesla? pls help :(

*December 18, 2013 by akameno*

**physics**

A copper wire has a diameter of 1.532 mm. What magnitude current flows when the drift velocity is 0.500 mm/s?

*September 14, 2013 by Justin*

**physics**

calculate the free electrons of a copper wire having a 0.064 inches diameter and 1000 ft. long?

*January 20, 2011 by vic*

**PHYSICS**

A FORCE OF 40N IS Applied at the end of wire 4m long and produced an extention of 0.24mm if the diameter of wire is 2.00mm.calculate stress on wire and strain in the wire

*June 5, 2016 by ESTHER*

**Physics**

Two cylindrical copper wires have the same mass and are at the same temperature. Wire A is twice as long as wire B. The resistance of wire A is related to that of wire B by : a) RA = RB/4 b) RA = RB/2 c) RA = RB d) RA = 2RB e) RA = 4RB

*September 24, 2014 by Anonymous*

**Physics**

Two cylindrical copper wires have the same mass and are at the same temperature. Wire A is twice as long as wire B. The resistance of wire A is related to that of wire B by a) RA = RB/4 b) RA = RB/2 c) RA = RB d) RA = 2RB e) RA = 4RB

*September 24, 2014 by Anonymous*

**physics**

A solenoid is wound with a single layer of insulated copper wire of diameter 2.800 mm and has a diameter 5.000 cm and is 1.500 m long. Assume that the adjacent wires touch and that the insulation thickness negligible. what is the inductance per meter(H/m) for the solenoid near...

*February 21, 2010 by Andy*

**physics**

A solenoid is wound with a single layer of insulated copper wire of diameter 2.800 mm and has a diameter 5.000 cm and is 1.500 m long. Assume that the adjacent wires touch and that the insulation thickness is negligible. what is the inductance per meter(H/m) for the solenoid ...

*February 21, 2010 by Andy*

**Math**

The electrical resistance, r ohms, of 1,000 ft of solid copper wire at 77¡ãF can be approximated by the model r = 10,770 / d^2 - 0.37 for any wire diameter, d mils (1 mil = 0.001 inch), such that 5 ¡Ü d ¡Ü 100. What is the approximate resistance, in ohms, for such with a...

*May 5, 2015 by Anonymous*

**physics**

Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the two wires compare? CHECK ALL THAT APPLY Wire A and wire B have the same resistance. Wire A has twice the resistivity of wire B. Wire...

*February 7, 2014 by Anonymous*

**Physics**

A nichrome wire of diameter 5mm and length 5m has resistivity of 10^-4 ohm meter. If wire is compressed to double it's diameter. Find the resistance in its new form. Also find the resistance of the wire originally ?

*November 20, 2016 by Kartik*

**physics EM**

You have a 0.600-m-long copper wire. You want to make an N-turn current loop that generates a 1.30 mT magnetic field at the center when the current is 0.600 A. You must use the entire wire. What will be the diameter of your coil? this doesnt seem that hard but I cant figure ...

*March 31, 2008 by Spencer*

**Physics**

A small but measurable current of 3.20 E-10 A. exists in a copper wire whose diameter is 0.03 cm. Calculate the electron drift speed (in meters/second).

*November 10, 2012 by andrew*

**Physics**

A copper wire that has been heated to 520 degrees Celsius for pliability is plunnged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper wire

*November 15, 2014 by Michelle*

**Physics**

A copper wire that has been heated to 520 degrees Celsius for pliability is plunged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper wire

*November 15, 2014 by Hemerla*

**Physics**

Look up or derive the frequencies of the standing waves of a length of wire, L, clamped at the ends and under tension. What are the similarities and differences between a vibrating string and a resonating pipe? Does the diameter of the wire matter? Does the diameter of the ...

*February 8, 2007 by Krys*

**physics**

1. A solid copper cylinder hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When the wire is struck, it emits sound with a fundamental frequency of 300 Hz. The copper cylinder is then submerged in water so that half its volume is below ...

*February 21, 2011 by vijay krishna*

**physics**

A solid copper object hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When the wire is struck, it emits a sound with a fundamental frequency of 135 Hz. The copper object is then submerged in water so that half its volume is below the ...

*November 29, 2014 by Maka*

**Chemisty**

Wire is often sold in pounds spools according to the wire guage number. That number refers to the diameter of the wire. How many meters are in 3-Ib spool of 12 gauge aluminum wire? A 12-guage wire has a diameter of 0.0808 in. Aluminum has a density of 2.70 g/cm^3. (V=3.14r^2L)

*January 19, 2012 by love*

**physics**

The magnetic ﬁeld in a loudspeaker is 0.2 T. The wire consists of 308 turns wound on a 4.12 cm diameter cylindrical form. The resistance of the wire is 8.2 Ω. Find the force exerted on the wire when 15.8 V is placed across the wire. Answer in units of N

*March 3, 2011 by Anonymous*

**physics**

A solid copper object hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When the wire is struck, it emits sound with a fundamental frequency of 300 Hz. The copper object is then submerged in water so that half its volume is below the ...

*February 16, 2011 by Rachel*

**physics**

The resistivity of copper is 1.3×10^-9 ohms. What is the length of a wire whose resistance is 0.25 ohms, diameter 10^-8 m.

*September 17, 2014 by schwartz mutohwe*

**Physics- Solenoid Questions**

1) A technician has been given wire that can safely carry 5 A. She has been instructed to construct a solenoid that will have a magnetic field of 0.06 T at its center. After completing some tests of the wire, the technician finds that the tightest safe winding possible with ...

*April 1, 2015 by Meli*

**physics**

A 34.7 cm diameter coil consists of 20 turns of circular copper wire 1.50 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 9.00E-3 T/s. Determine the current in the loop. Determine the rate at which thermal energy is produced.

*October 18, 2010 by VJC*

**physics**

A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre of AB the bar remains...

*March 27, 2010 by Edwin*

**physics**

A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre of AB the bar remains...

*March 28, 2010 by Edwin*

**Physics**

A wire of length 5.0 m and diameter 2.0 mm extends by 0.25 mm when a force of 50 N was used to stretch it from its end. Calculate the (a)stress on the wire (b)strain in the wire

*May 24, 2015 by Saka*

**magnetic field**

A straight copper wire that is 1 milimeter in diameter carries a current of 20 miliamps. Whas the magnitude of the largest magnetic field created by this wire in Tesla?

*December 16, 2013 by marie*

**phys102**

a copper wire has a diameter of 1.02mm,the wire carries a constant current of 1.67A,the density of the free electrons is 8.5X10^28 e/m^3.calculate the current density and drift velocity

*August 14, 2010 by kabelo*

**physics**

A circular steel wire 2.00 m is to stretch no more than 0.25 cm when a tensile force of 400 N is applied to each end of wire. What minimum diameter is required for the wire?

*August 22, 2009 by colleen*

**Physics**

Two wires are identical, except that one is aluminum and one is copper. The aluminum wire has a resistance of 0.835. What is the resistance of the copper wire? Take the resistivity of copper to be 1.72 x 10-8 Ω·m, and that of aluminum to be 2.82 x 10-8 Ω·m.

*June 5, 2013 by Tim*

**physics**

A wire of diameter 0.65mm and length 6.0m stretches 10mm when 5.5kg is hung from it. What is the Young's modulus for the wire and what is the effective spring constant for the stretching wire

*April 19, 2012 by Kirk*

**Physics**

A copper wire is 7.00 m long and has a cross-sectional area of 1.00 10-4 m2. This wire forms a one turn loop in the shape of a square and is then connected to a battery that applies a potential difference of 0.200 V. If the loop is placed in a uniform magnetic field of ...

*November 11, 2010 by Max*

**physics**

When exposed to sunlight, a hole in a sheet of copper expands in diameter by 0.154% compared to its diameter at 74∘F. Part A What is the Celsius temperature of the copper sheet in the sun?

*December 4, 2013 by Help! finals next week*

**Physics**

What is the resistance of a 4.00 m length of copper wire having a diameter of 2.00 mm at a temperature of 20 degrees? R= ? L= 4.00 m resistivity= 1.72 * 10^-8 ohm-meters A= ? A= pi*r^2 change 2 mm to .002m, square it and multiply by 3.14 I got .00001256 Is this right so far?

*May 9, 2011 by Anonymous*

**PHYSICS**

A copper wire and an aluminium wire have length's in the ratio 3:2.diameters n the ratio 2:3 AND FORCES APPLIED IN THE RATIO 4:5 find the ratio of increase in length of the two wires.(Y FOR COPPER =1.1*1O^11 N/m^2,Y for aluminum=0.70*10^11 N/m^2). ans: 1)189:110

*February 4, 2013 by kalawathi*

**Chemistry (algebra I problem)**

I feel really dumb because I cant figuer out this simple algebra I problem... 84. The diameter of a copper (Cu) atom is roughly 1.3 x 10^-12 m. How mnay times can you divide devenly a piece of 10-cm copper wire until it is reduced to two separate copper atoms? (Assume there ...

*June 28, 2010 by Kate*

**Physics**

a uniform magnetic field of strength 0.5T is directed at an angle of 30degree to the plane of 100turns regular copper coil of lenght 0.04m and width 0.05mm. the diameter of the copper wire which makes up a coil is 1mm and the resistivity of copper is 0.000000017ohms meter. the...

*July 12, 2016 by Akin*

**physics**

A potential difference of 12 V produces a current of 0.90 A in a piece of copper wire. What is the resistance of the wire?

*March 20, 2011 by maria*

**physics**

A potential difference of 12 V produces a current of 0.90 A in a piece of copper wire. What is the resistance of the wire?

*March 22, 2011 by maria*

**Math**

The electrical resistance of a wire waves directly as its length & inversely as the square of its diameter if a wire 30m long and 0.75mm in diameter has a resistance of 25ohms , find the length of a wire of the same material whose resistance is 30ohms whose diameter is 1.25mm ...

*January 29, 2016 by Helena*

**college algebra**

The electrical resistance of a wire of a given material varies as its length and inversely as the square of the diameter. if a wire 300 feet long and 0.05 inches in diameter has a resistance of 30 ohms, (a) find the resistance of a wire which is 1000 feet long and 0.02 inch in...

*April 5, 2016 by Sam*

**Physics**

A weight of 40N was attached to the end of a wire during modulus experiment, if the length of the wire is 4m and the diameter is 0.44mm and the extension recorded is 0.30mm. calculate the stress and strain of the wire?. take[Pi=3.142

*January 22, 2011 by Ochuko*

**Physics: Diameter of a nichrome wire**

If 49 m of nichrome wire is to have a resistance of 13.0 ohms at 20°C, what diameter wire should be used? I've done this: (108e-8)(49)/10.0 ohms = 5.29e-6m^2 Then 5.29e-6m^2/pi then r = sqrt(1.68e-6m^2) and got .00129 = 1.29e-3 1.29mm r=2(1.29mm) = 2.58mm But this is wrong. ...

*September 9, 2010 by Sar*

**physic**

The resistance of a copper wire of diameter 10mm and length 2m is 15 Ω. Determine the new resistance if i) the length is doubled and the diameter halved ii) the length increases by three fold and the diameter doubled iii) the length decreases by two fold and the diameter ...

*February 11, 2011 by hans*

**physics**

A piece of copper wire has a resistance per unit length of 6.45*10-3 /m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.140 m. The ends of the wire are connected to a 12.0 V battery. Find the magnetic field strength at the center of the coil.

*February 11, 2008 by rick*