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Two conentrics spherical shell of ra...

Two conentrics spherical shell of radius R and 2R having intial charges Qand 2Q respectively as shown . One closing the switch S charge flow form outer sphere to earth is nQ. Find n.

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The correct Answer is:
C
On closing the switch potential of outer shell is zero
`(KQ)/(2R)+(KQ_1)/(2R)=0, Q_1=-Q` charge flow -3Q
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