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Two uniformly charged non-conducting he...

Two uniformly charged non-conducting hemispherical sheels each having uniform charge density `sigma` and radius R form a complete sphere (not stuck together) and surround a concentric spherical conducting shell of radius R/2. If hemispherical parts are in equilibrium then minimum surface charge density of inner conducting shell is :

A

`-2sigma`

B

`-sigma//2`

C

`-sigma`

D

`2sigma`

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The correct Answer is:
A
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