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Unformatted text preview: F R = e q 4 o R 2 . (a) If we require F = 1 2 F R , and solve for r , we obtain r = 2 R . Since the problem asks for the measurement from the surface then the answer is 2 R R = 0.41 R . (b) Now we require F inside = 1 2 F R where F inside = eE inside and E inside is given by Eq. 2320. Thus, e q 4 o R 2 r = 1 2 e q 4 o R 2 r = 1 2 R = 0.50 R ....
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 Spring '10
 Rebello,NobelS
 Charge, Force

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