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Voltage problem

  1. Sep 30, 2008 #1
    Can someone see what I am doing wrong here?

    A charge of q = +10-7 C is uniformly distributed on a spherical shell of radius 15 cm.

    (a) what is the E field just outside the shell.

    Isn't the E field given by k*Q/R^2 where Q is total charge (10e-7 C) and R, since it's immediately outside, .15m? So wouldn't I get 399.555 kV?

    (b)what's the magnitude of potential just inside and outside of the shell, and at the center?

    Isn't the E potential just k*Q/R, where R is the radius of the shell. And it's the same value everywhere inside because since the field is 0 so the potential must be constant. So wouldn't the answer be (8.99e9)*10e-7/.15 = 59933.333 V?

    Thanks.
     
  2. jcsd
  3. Sep 30, 2008 #2

    Defennder

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    Homework Helper

    Looks ok, but check your units.

    Looks ok as well, if you substituted and computed the numbers properly.
     
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