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Question

Consider two concentric conducting spheres. The outer sphere is hollow and the inner sphere is solid. Initially, they are given a charge 7Q and a charge 2Q respectively, then the charges on the outer surface and inner surface of the outer sphere is

A
2Q,7Q
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B
+2Q,9Q
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C
2Q,5Q
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D
+2Q,+5Q
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Solution

The correct option is C 2Q,5Q
Outer sphere is hollow and given a charge of 7Q
Inner sphere is solid and given a charge of +2Q

Charge on outer surface of outer sphere
=7Q+2Q=5Q
Charge on inner surface of outer sphere =2Q
Hence, option C is correct


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