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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+Kqr1=0q=q r1r2

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