# As Physics

T = time(s)
I=current (amps)
Q=net charge on object (Coulombs)
N=no electrons (and write if added or removed from object and how)
E=elementary charge

Two copper wires of diameter 1 mm and 2 mm are joined end to end in a circuit.
a) Calculate the ratio of the mean drift velocities of the electrons in the two wires if the same current passes through each of them.
b) In which wire will the electrons move faster and why?

As physics - bobpursley Tuesday, December 12, 2017 at 10:25am
you changed the area by 4x.
current=driftvelocity*electrondensitypervolume*area
so if electron density/volume is the same, and area of one is 4x, then drift velociyt is 1/4 because current is constant.

At first before your response i converted to metre so 0.001m and 0.002m and then i found the area for both so for the first it is 7.85 X 10^-7 and the second it is 3.14 X 10^-6. then i did I=Anev for both wires

Copper wire 1:
n= work out
i= SAME CONSTANT
A=7.85 X 10^-7
e= 1.6 X 10^-19
v=??

copper wire 2:
n=work out
i=Same CONSTANT
A=3.14 X 10^-6
e= 1.6 X 10^-19
v=??
and o couldnt work out either as more than one value was missing but i tried to make i equal 1 as their both the same buuit still 2 values missing. Then i read Bobs comment and got confused about where the 4 came from and am still confused with both parts to this question please help!!

1. 0
2. 0
3. 7
1. give me a break. If you double diameter, area is quadrupled (4x). You are doing a lot of math for no purpose.

you changed the area by 4x.
current=driftvelocity*electrondensitypervolume*area
so if electron density/volume is the same, and area of one is 4x, then drift velociyt is 1/4 because current is constant.

1. 0
2. 0
posted by bobpursley
2. in which wire will the electrons move faster and why?

1. 0
2. 0
posted by cylinder

## Similar Questions

1. ### math

Consider the sequence of steps to solve the equation: 2(x − 4) + 6x = 9x − 10 Which step in solving this equation is justified by the Commutative Property of Addition? Given ⇒ 2(x − 4) + 6x = 9x − 10 Step 1 ⇒ 2x − 8

asked by Anonymous on October 25, 2018
2. ### English

Procedure : Group Activity Looking at the picture on the left, let's play the guessing game. I have some pictures. Look at this picture. What is he doing? Guess what he is doing and say like this: He is running. I think he is

asked by John on June 9, 2008
3. ### ALGEBRA HELP

When solving the equation, what property was used to go from step 3 to step 4? Step 1: -(2x+3= x-18 Step 2: -2x-3=x-18 Step 3: -3=3x-18 Step 4: 15=3x A)APOE B)SPOE C)MPOE D)DPOE

asked by cv on October 22, 2013
4. ### chemistry

What is the percent ionization of a 1.38 mol/L weak acid if its Ka = 2.7 x 10-6? Answer to two (2) decimal places. I know what steps to use but have difficulty applying them to the quesiton Can someone please complete the question

asked by Anna on April 19, 2008
5. ### Physics

An arrow is shot straight up from the edge of a cliff with an initial velocity of 50 ft/s. Answer the following questions using English units. The acceleration due to gravity has a magnitude of 32.2 ft/s. A. Find the time to reach

asked by Maggie on August 22, 2016
6. ### Chemistry

In a chain mechanism, a reaction in which two free radicals combine to form a stable molecule would be called the A) initiation step B) termination step C) propagation step D) inhibition step E) branching step

asked by Haley on April 8, 2015
7. ### Algebra help

f(x)=x^3-4x^2-x+4 How do I find the x-intercept for this? This is from my book: step 1: 0=x^3-4x^2-x+4 step 2: 0=x^2(x-4)+(-1)(x-4) step 3: 0=(x^2-1)(x-4) I know how to solve once I get to step 3, but in step 2, I don't know what

asked by Claure on June 16, 2009
8. ### math

An equation and the steps to solve it are shown below: 3x − one over two (8x − 2) = 4 Step 1: 3x − 4x + 1 = 4 Step 2: x + 1 = 4 Step 3: x + 1 − 1 = 4 − 1 Step 4: x = 3 Which step was the error made and why? Step 1,

asked by oscar on September 4, 2015
9. ### math

An equation and the steps to solve it are shown below: 3x − one over two (8x − 2) = 4 Step 1: 3x − 4x + 1 = 4 Step 2: x + 1 = 4 Step 3: x + 1 − 1 = 4 − 1 Step 4: x = 3 Which step was the error made and why? Step 1,

asked by oscar on September 4, 2015
10. ### aps

There are 26 step on flpor at the time saad comes down two step imad step up one step When will tyey meet at what step?

asked by sayed on January 24, 2017
11. ### Math

In which step is the error? Step 1: Let x = 1 and y = 1. Step 2: By substitution xy = y^2. Step 3: Multiplying both sides by -1, -xy= -y^2. Step 4: Adding x^2 to both sides, x^2-xy=x^2-y^2. Step 5: Factoring, x(x-y)=(x+y)(x-y).

asked by Hannah on February 1, 2016

More Similar Questions