According to Faraday’s law, the voltage generated when a magnet is pushed through a coil is dependent on several variables. In addition to the rate of change of the magnetic field, which of the following choices affects the induced voltage?

9,796 results
  1. physics

    A 200-loop coil of cross sectional area 8.5 cm2 lies in the plane of the page. An external magnetic field of 0.060 T is directed out of the plane of the page. The external field decreases to 0.020 T in 12 milliseconds. (a) What is the magnitude of the

  2. science

    According to Faraday’s law, the voltage generated when a magnet is pushed through a coil is dependent on several variables. In addition to the rate of change of the magnetic field, which of the following choices affects the induced voltage? a) number of

  3. physics

    A flywheel has a small magnet mounted on it. EAch time the magnet passes the coil, a voltage pulse is generated, which is passed to the c.r.o. The display of the c.r.o. is 10cm wide. The flywheel is rotating at a rate of about 3000 revolutions per

  4. science

    The secondary coil consists of 20 loops and has an output voltage of 80 V. If the primary coil had 100 loops, what was the voltage across the primary coil? 400 V 80 V 25 V 20 V

  5. Science

    The primary coil consists of 2 loops and there is a voltage of 6 V across the coil. If the secondary coil consists of 10 loops, what is the induced voltage? 30 V 11 V 3.3 V 6 V

  6. physics

    A circular coil with a radius of 25 cm has 20 turns. The coil is oriented perpendicularly to a magnetic field whose initial magnitude is 3.2 T. Suddenly, the magnetic field vanishes in 0.4 s. a. What is the initial magnetic flux in the coil? b. What is the

  7. physics

    Find the turn ratio in a transformer which deliver a voltage of 120volts in the secondary coil form a primary voltage at 60v. Please someone should help me with this

  8. science

    Which option most accurately defines Faraday’s law? A.Any change in the electric field over a conductor will produce an magnetic field inside a conductor. B.The voltage generated in a coil is inversely proportional to the number of electrons in the loop.

  9. physics

    Moving a magnet inside a coil of wire will induce a voltage in the coil. How is the voltage in the coil increased? by moving the magnet inside the coil of wire more slowly by moving the magnet inside the coil of wire more rapidly by holding the magnet

  10. electronics technician

    19. In a solenoid, where is the magnetic field strongest? A. Outside the coil C. At the north pole B. Inside the coil D. At the south pole 20. What is a typical coil voltage for a low-voltage relay circuit? A. 2 VDC C. 12 VDC B. 5 VDC D. 120 VDC 21.

  11. physics

    a strong magnet attracts a paper clip to itself with a certain force. Does the paper clip exert a force on the strong magnet? If so, why not? If so, does it exert as much force on the magnet as the magnet exerts on it? Newtons Third Law: Forces are always

  12. physics problem

    Q:A 50 turns coil in a generator has an area 500cm(square)rotates in magnetic field with B=1.76 w/m(square), how fast must the coil be rotated in order to generate a maximum voltage of 220 volt? PLZ EXPLAIN WITH DATA!

  13. Science

    1. The south pole of a magnet is held 2 inches from the north pole of a second magnet, and the force between them is measured. If the magnets are moved to 4 inches apart, the force will __________. A. not change B. be doubled C. be halved D. be quartered

  14. physics prob.

    An ideal transformer has 50 turns in its primary coil and 250 turns in its secondary coil. 12 V is connected to the primary. a)find the voltage across the secondary coil. b) find the current in a 10-ohms device connected to the secondary. c) find the power

  15. Physics problem

    A transformer has 50 turns in its primary coil and 250 turns in its secondary coil. 12V is connected to the primary. a. Find the voltage across the secondary coil. b. Find the current in a 10 ohm device connected to the secondary. c. Find the power

  16. Physics

    13. George has a bar magnet and a coil connected to a battery. To perform an experiment, he needs to use different values of current through the wire. How can he generate different values of electric current through the wire without connecting any other

  17. Voltage

    If a transformer has 3,000 loops in its primary coil and 1,500 loops in its secondary coil, how do I find the voltage in the secondary coil if the voltage in the primary coil is 120V? Is there a formula? HELP, please!

  18. Chemistry

    A step-down transformer has 200 turns of wire in its primary coil. How many turns are in the secondary coil if the input voltage = 120V, and the output voltage = 6V

  19. physcial science

    A transformer has a primary coil with 600 turns and a secondary coil with 300 turns. If the output voltage is 320 volts, what is the input voltage? A. 8 volts B. 150 volts C. 640 volts D. 600 volts

  20. physics #22

    A length of wire is bent into a closed loop and a magnet is plunged into it, inducing a voltage and,consequently, a current in the wire. A second lenghtof wire, twice as long, is bent into two loops of wire, and a magnet is similarly plunged into it. Twice

  21. Physical Science Question 4

    How can a permanent magnet be demagnetized? A.Cut the magnet in half. B.Heat the magnet up C.Strike the magnet with a heavy blow D.both b and c You will find the answer if you read this: http://my.execpc.com/~rhoadley/magcare.htm

  22. Physical Science

    If a step-up transformer has a primary coil with 40 turns, how many turns would be required in the secondary coil in order to increase the voltage from 80 volts to 160 volts?

  23. electricity

    if a bar of copper is brought near a magnet, the copper bar will be? A)attracted by the magnet. B)unaffected by the magnet. C)repelled by the magnet. D)made into an induced magnet. B)unaffected by the magnet. Actually there is a very slight repulsn due to

  24. physics

    An electrical device contains a transformer. Its primary coil has 200 turns, and its secondary coil has 20 turns. If the device is plugged into a 120-volt line, what is the output voltage of the device?

  25. Electromagnetic induction-check answers

    Please check my answers: why does an iron core increase the magnetic iduction of a coil of wire? -I am thinking it has something to do with the voltage being increased. Will a cyclist coast farther if the lamp is connected to the generator on his bicycle

  26. Physics

    Faraday's law: If the number of loops in a coil around a moving magnet doubles what happens to the brightness of the bulb if the speed of the magnet remains the same?

  27. PHYSICS

    A 0.75 Tesla bar magnet is placed inside of a coil made up of 350 turns of wire, each loop having an area of 0.002 m^2. How much electromagnetic flux is created when the magnet is quickly pulled out of the coil? How much voltage is induced in the coil if

  28. magnetism

    Moving a magnet inside a coil of wire will induce a voltage in the coil. How can the voltage in coil be increased? move the magnet inside the coil of wire more slowly hold the magnet stationary move the coil of wire slowly and keep the magnet stationary

  29. Physics

    Peter has a square shaped coil which include two turns of wires. One day he takes this coil to his physics lab in his school. He wants to find the voltage generated in the coil when he placed the coil inside a varying magnetic field. So he connected a

  30. Physics - Flux

    The coil has a radius of 8 cm and 110 turns. While moving the magnet farther away from the coil, at a certain point in time, the voltage meter shows -390 mV. What is the magnitude of the rate of change of the flux through the coil?

  31. Physics Help!

    The Fly wheel has a small magnet of mass M mounted on it. Each time the magnet passes the coil, a voltage pulse is generated , which is passes to the c.r.o the display of the c.r.o is 10 cm wide . The flywheel is rotating at a rate of about 3000

  32. Physics

    Consider a simple alternating current generator such as Hippolyte Pixii's dynamo. The current generated by such dynamo can be described as simple oscillating cosine signal. Assuming for simplicity that the max current generated each time a pole of Pixii's

  33. science

    A magnet is plunged into and out of a coil of wire 2 times per second. This induces 5 volts. a- If the rate of motion changes so that the magnet is plunged in and out 6 times per second, what will be the new induced voltage?

  34. physics

    A magnet is plunged into and out of a coil of wire 2 times per second. This induces 5 volts. a- If the rate of motion changes so that the magnet is plunged in and out 6 times per second, what will be the new induced voltage? b- if the number of coils in

  35. physics

    When you increase the number of turns in a coil to induce more voltage, you do which of the following?. A) only get more voltage if the resistance of the larger coil remains unchanged.B) None of the above.C) do more work to induce the greater voltage.D)

  36. physics

    When you increase the number of turns in a coil to induce more voltage, you do which of the following?. A) only get more voltage if the resistance of the larger coil remains unchanged.B) None of the above.C) do more work to induce the greater voltage.D)

  37. Physical science

    consider a flat square coil with 10 turns. The coil is 1m wide on each side and has a magnetic field of 1,0T passing through it. The plane of the coil is perpendicular to the magnetic field: the field points out of the page. Use faraday's law to calculate

  38. Science

    A step-up transformer increases voltage 20 times. If the voltage of the primary coil is 1200V, what's the voltage of the secondary coil? Please help. Thank You!

  39. physics

    A transformer has N1=709turns in the primary coil and N2=1848turns in the secondary coil. If the input voltage is v(t)=218cos(Ωt) V, what rms voltage, in volts, is developed across the secondary coil?

  40. physics 2

    the primary coil of a transformer has N1 = 375 turns, and its secondary coil has N2 = 1,875 turns. If the input voltage across the primary coil is Δv = (120 V)sin ωt, what rms voltage is developed across the secondary coil?

  41. physics opinion

    A common pickup for an electric guitar consists of a coil of wire around a permanent magnet. The permanent magnet induces magnetism in the nearby guitar string. When the string is plucked, it oscillates above the coil, thereby changing the magnetic field

  42. Physics

    A transformer has 3000 loops in its primary coil and 1500 loops in its secondary coil. What is the voltage in the secondary coil if the voltage in the primary coil is 120 V??? ***PLEASE explain how you get the answer*** thank you:)

  43. college physics

    small one-cylinder gasoline engines sometimes use a device called a magneto to supply current to the spark plug. A permanent magnet is attached to the flywheel, and a stationary coil is mounted adjacent to it. Explain how this device is able to generate

  44. science

    if a magnet is moved in and out of a coil of a copper wire, electrcity begins to flow through the coil. True or False If the coil is in a closed circuit then electricity will flow, if not there will be only an induced emf.

  45. physics

    A 39-turn circular coil of wire has a diameter of 1.2m. It is placed with its axis along the direction of the Earth's magnetic field of 58μT at 52° below the horizontal, and then in 0.16s it is flipped 180°. a) What is volts the magnitude of the average

  46. science

    A transformer has 3,000 loops in its primary coil and 1,500 loops in its secondary coil. What is the voltage in the secondary coil if the voltage in the primary coil is 120 V?

  47. physics

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns a second coil wrapped around the same coil has to

  48. physics

    A student thrusts a 0,20T magnet with a cross sectional area of 2.0 cm^2 into a coil of 400 turns in 0,50s. The coil has a resistance of 30 ohms and it is connected in series with a moving coil meter having a resistantace of 170 ohms. What is the average

  49. physics

    A student thrusts a 0,20T magnet with a cross sectional area of 2.0 cm^2 into a coil of 400 turns in 0,50s. The coil has a resistance of 30 ohms and it is connected in series with a moving coil meter having a resistantace of 170 ohms. What is the average

  50. Physics

    I have a 250- turn circular coil of wire, 0.10 m in diameter, perpendicular to a 0.050 T magnetic field as shown below. I flip the coil 180 degrees in 1/30 of a second. What is the average voltage created across the ends of the coil? A. -6.0 V B. -12 V C

  51. College Physics

    A 22 turn circular coil of radius 5.00 cm and resistance 1.00 is placed in a magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies in time according to the expression B = 0.0100t + 0.0400t2, where t is

  52. Physics

    1. A rectangular coil 0.065 m by 0.080 m is positioned so that its cross-sectional area is perpendicular to the direction of a magnetic field. The coil has 66 turns and a total resistance of 7.6 Ω and the field decreases at a rate of 2.5 T/s. What is the

  53. science

    A magnet is plunged into and out of a coil of wire 2 times per second. This induces 5 volts. b- If the number of coils in the wire is doubled from 100 to 200, and the original rate of 2 times per second kept the same, what will be the new voltage induced?

  54. physical science

    A magnet is plunged into and out of a coil of wire 2 times per second. This induces 5 volts. If the number of coils in the wire is doubled from 100 to 200, and the original rate 2 times per second is kept the same, what will be the new voltage induced.

  55. Physics -HELP

    1. A rectangular coil 0.065 m by 0.080 m is positioned so that its cross-sectional area is perpendicular to the direction of a magnetic field. The coil has 66 turns and a total resistance of 7.6 Ω and the field decreases at a rate of 2.5 T/s. What is the

  56. physics

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  57. physics

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  58. PHYSICS

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  59. Physics

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  60. math

    The voltage (in volts) induced in a coil of wire is v = (2t + 1)^0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?

  61. Math

    The voltage (in volts) induced in a coil of wire is v = (2t + 1)^0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?

  62. math

    The voltage (in volts) induced in a coil of wire is v = (2t + 1)0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?

  63. Algebra

    The heat generated by a stove element varies directly as the square of the voltage and inversely as the resistance. If the voltage remains constant, what needs to be done to triple the amount of heat generated? I need to know why this makes sense or not.

  64. Phys..magnets

    can someone please explain this aim: To investigate how the force acting on a bar magnet placed in a current carrying coil is related to the coil??? what is the force called?

  65. physics

    the turn ratio of transformer is 1:10.A battery of 12v is connected to the primary coil,what is the voltage drop across the secodary coil

  66. Physics

    The primary coil of a transformer has 739 loops. The secondary coil has 953,677 loops. The primary coil has a 76 A current and 58 V. b.) Determine the power of the primary coil. W c.) Assuming no losses, determine the power of the secondary coil. W d.)

  67. physic help

    The magnetic flux through a coil of wire changes from 8 Txm ^2 to zero in a time 0.5 s. what is the magnitude of the average voltage induced in the coil during this change? please explain your answer..

  68. physics

    I'm not sure how to deal with this problem (we're just starting the unit)... I need to find the average voltage induced into a 100 turn coil by a vertical wire when the wire's current drops from 602A to 0A in 0.01 seconds. ...if the coil was drawn as a

  69. Physics - Transformer in AC

    A soldering iron uses an electric current in a wire to heat the tip. A transformer with 100 turns on the secondary coil provides 54 W at an rms voltage of 26 V. a) How many turns are in the primary coil? b) What is the current in the primary coil?

  70. Physics

    A soldering iron uses an electric current in a wire to heat the tip. A transformer with 100 turns on the secondary coil provides 54 W at an rms voltage of 26 V. a) How many turns are in the primary coil? b) What is the current in the primary coil?

  71. physics

    A transformer with 360 turns in its primary coil and 18 turns in its secondary coil is designed to delivered an average power of 1400 W with a maximum voltage of 60 V. What is the maximum current in the primary coil?

  72. physics

    A 19 turn circular coil of wire has diameter 1.09 m. It is placed with its axis along the direction of the Earth's magnetic field of 51.0 µT, and then in 0.195 s it is flipped 180°. An average emf of what magnitude is generated in the coil?

  73. Physical Science

    I am working on PS and I have a couple of questions. 1) If 24 amperes of current flows through an appliance connected to a 120-volt circuit what is the resistance of the appliance. A).22 ohms b)5 ohms c)50 ohms d)2880 ohms I am not sure how to go about

  74. College Physics

    A multiple loop configuration is rotating at 60 Hz in a magnetic field of 0.12 T. The coil has an area of 0.0052 m2. How many coil loops are required to produce a maximum voltage difference of 170 V?

  75. Science 30

    A step-up transformer has a coil with 100 turns and a coil with 10000 turns. If the input voltage is 12.0 kV, the input current is 10.0 A, and the output voltage is 1200 kV, then what is the output current

  76. Science

    A transformer with 1890 turns in its primary coil has to decrease the voltage from 4620 V to 220 V for home use. How many turns should there be on the secondary coil?

  77. college

    A device uses an AC voltage of 4320 V, which is obtained from a standard 120.0 V outlet by means of a transformer. If the primary coil has 21 turns, how many turns are in the secondary coil?

  78. physics

    A strong electromagnet produces a uniform field of 1.31 T over a cross-sectional area of 0.195 m2. A coil having 245 turns with a total resistance of 16 is placed around the electro- magnet, and the current in the electromagnet is turned off, reaching zero

  79. Physics

    1. Ohm's Law states that for some circuits the voltage is proportional to the current. In other words, if you double the voltage, you will double the current. Which of these equations agrees with this statement of Ohm's Law? (∝ means "is proportional

  80. Physics pls help

    Consider two single turn coils labeled 1 and 2 that are positioned close to each other. The switch S has been open for a long time. If the switch is now closed and the current through coil 1 is in the direction shown and increasing, which of the following

  81. PHYSICS

    Consider two single turn coils labeled 1 and 2 that are positioned close to each other. The switch S has been open for a long time. If the switch is now closed and the current through coil 1 is in the direction shown and increasing, which of the following

  82. Physics Help pls

    Consider two single turn coils labeled 1 and 2 that are positioned close to each other. The switch S has been open for a long time. If the switch is now closed and the current through coil 1 is in the direction shown and increasing, which of the following

  83. magnetism

    How can a permanent magnet be demagnetized? cut the magnet in half heat the magnet up (my choice) strike the magnet with a heavy blow both the second and third choices above

  84. Physical Science

    A model electric train requires 12 V to operate. When connected to a household voltage of 120 V, a transformer is needed. If the primary coil has 500 turns, how many turns must the secondary coil have?

  85. Physics

    A transformer consists of 275 primary windings and 834 secondary windings. If the potential difference across the primary coil is 25 V, (a) What is the voltage across the secondary coil? (b) what is the effective load resistance of the secondary coil if it

  86. Physics

    A transformer consists of 275 primary windings and 834 secondary windings. If the potential difference across the primary coil is 25 V, (a) What is the voltage across the secondary coil? (b) what is the effective load resistance of the secondary coil if it

  87. physics

    Magnet A has twice the magnetic field strength of magnet B and at a certain distance pulls on magnet B with a force of 75 N. With how much force, then, does magnet B pull on magnet A?

  88. Fourth grade science

    Students are conducting an investigation that tests the force of a magnet by using one magnet to repel a second magnet. Which tool would be needed to measure the distance the second magnet moves? A thermometer,A spring scale, A ruler, or A compass

  89. Physics

    A rectangular coil of wire has a dimensions of 4.9 cm by 9.7 cm and is wound with 84 turns of wire. It is turned between the pole faces of a horseshoe magnet that produces an approximately uniform field of 0.54T, so that sometimes the plane of the coil is

  90. electrical

    when ever a conductor move thought a magnetic field a voltage is in cluded what factors deter mine the amount of voltage that is generated

  91. electrical

    when ever a conductor move thought a magnetic field a voltage is in cluded what factors deter mine the amount of voltage that is generated

  92. phys

    or..can someone tell me what will happen when a bar magnet is placed in a current carrying coil?

  93. physics

    calculate the current in the secondary coil when the current in the primary coil is 0.50 A. there are 200 turns in the primary coil and 3000 turns on the secondary. the input voltage is 55 v

  94. Physics

    A 240volts is applied to a primary coil of a step up transformer. What is the ratio of the secondary turn to the primary turns, if the voltage available at the secondary coil is 360volts.?

  95. Physics

    A coil of 50turns is pulled in 0.02secs from between the poles of a magnet where it's area includes 31× 10^-5 Weber to a place where it's area includes 1 x 10^-5 Weber.Determine the average emf induced in the coil A.0.75V B.0.075 C.75V D.7.5V?

  96. Physical Science

    A step-up transformer has primary coil with 15 turns. How many turns would be required in the secondary coil to increase the voltage from 60 v to 160 v? 15 x=160/80 x=80/15 x=?

  97. Physics

    In Europe, the standard voltage is 230 V (rms), AC, and 50 cycles/s. Suppose you take your 5.00 W electric razor to Rome and plug it into the receptacle (with an adapter to fit the receptacle but not to change the voltage). (The standard voltage in the

  98. physics

    Using a coil made of 117 turns of single-strand copper wire, you use a motor to rotate the coil at a constant angular speed of 30.0 revolutions per second at various orientations and locations throughout the room. In one particularly significant

  99. electromagnetism

    Two identical bar magnets A and B are held at rest as shown and released to fall simultaneously. Magnet A as it falls passes through the center of a copper ring, magnet B does not. #9 (4 points possible) Which of the following statements is true? -

  100. Industrial electronics

    A voltage at a frequency of 500KHz is maintained across a coil with a variable capacitor .when the capacitor is set to 455pF, the current has its maximum value, but when the capacitance is reduced to 424pF , the current is 0,707 of its maximum value.

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