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Consider two concentric spherical metal shells of radii `r_1` and `r_2(r_2gtr_1)`. If the outer shell has a charge q and the inner one is grounded, the charge on the inner shell is

A

`(-r_2)/r_1q`

B

zero

C

`(-r_1)/r_2q`

D

`-q`

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The correct Answer is:
C
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