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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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