A conducting sphere of radius R, and carrying a charge q is joined to a conducting sphere of radius 2R, and carrying a charge – 2q. The charge flown between them will be?
A
q3
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B
2q3
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C
q
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D
4q3
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Solution
The correct option is D4q3 Initial charge on sphere of radius R = q Charge on this sphere after joining =q′=Rq+(−2q)×RR+2R=−q×R3R=−q3 So charge flown between them =q−(−q3)=4q3