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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 RV 
(1.0 × 10−6 m)(400V)
=
=
= 2.8 × 105 .
2
e
e
(8.99 × 109 N · m2 /C )(1.60 × 10−19 C) ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics, Charge, Electric Potential

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