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Unformatted text preview: 5. Since the magnitude of the electric ﬁeld produced by a point charge q is given by E = |q |/4πε0 r2 , where
r is the distance from the charge to the point where the ﬁeld has magnitude E , the magnitude of the
(0.50 m)2 (2.0 N/C)
|q | = 4πε0 r2 E =
= 5.6 × 10−11 C .
8.99 × 109 N · m2 /C2 ...
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