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A solid sphere of radius a is concentric with a hollow sphere of radius b, where b>a. If the solid sphere has a uniform charge distribution totalling +Q and the hollow sphere a charge of -Q, which one of the followings is the electric field at radius r , where rA) kQ/r² B) kQ/a² C) kQr/a³ D) Zero E) kQ/b²
Sagot :
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