Questions
Twenty seven identical drops of mercury are charged simultaneously to the same potential of 10 units, Assuming the drops are made to combine to form one large drop, then its potential is
detailed solution
Correct option is D
Let r be the radius sf small drop and R, the radius of big drop. Then 43πR3=(27)43πr3 or R=3rCharge on bigger drop = 27 qV=14πεn×27q3r=914πε0×qr=9×10=90 units.Talk to our academic expert!
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Four equal charges Q are placed at the four comers of a square of each side is 'a'. Work done in removing a charge -Q from its centre to infinity is
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