Two concentric conducting spheres are of radii r1 and r2. The outer sphere is given a charge q. The charge q′ on the inner sphere will be (inner sphere is grounded) :-
A
q
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B
−q
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C
−qr1r2
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D
Zero
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Solution
The correct option is C−qr1r2
Due to earthing, potential of inner sphere in zero V=0 Kqr2+Kq′r1=0⇒q′=−qr1r2