Unformatted text preview: 51. If the electric potential is zero at inﬁnity, then the potential at the surface of the sphere is given by
V = q/4πε0 r, where q is the charge on the sphere and r is its radius. Thus
q = 4πε0 rV = (0.15 m)(1500 V)
= 2.5 × 10−8 C .
8.99 × 109 N · m2 /C2 ...
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