Charge Volume Density To Charge Per Unit Length

  • Thread starter Baumer8993
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  • #1
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Homework Statement


http://imgur.com/VzZjSEH

I took a screen shot so I did not leave anything out.


Homework Equations


Surface area, and volume of a sphere.


The Attempt at a Solution



I am trying to find the linear charge density from the charge volume density. I got it explained from a friend. It was right, but made no sense. He did it by taking the volume density, and multiplying it by the charge volume density by pi, and (outer r2 - inner r2).

So he did -657 * pi * (.0422 - .0262)

Can someone explain to me how this is right?
 

Answers and Replies

  • #2
rude man
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It's the total charge per unit length due to the outer insulator. Charge = voume charge density x volume. The volume of the insulator is pi(r2^2 - r1^2) x 1 unit length. Multiply by the charge density rho and you have your answer.

Of course, the complete answer must include the linear charge density of the wire as well.
 
  • #3
vela
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Calculate the total charge Q of a length ##l## of the insulator. Then divide Q by ##l##.
 

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