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Unformatted text preview: 61. If the electric potential is zero at inﬁnity then at the surface of a uniformly charged sphere it is V =
q/4πε0 R, where q is the charge on the sphere and R is the sphere radius. Thus q = 4πε0 RV and the
number of electrons is
N= |q |
4πε0 R|V |
(1.0 × 10−6 m)(400V)
= 2.8 × 105 .
(8.99 × 109 N · m2 /C )(1.60 × 10−19 C) ...
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