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Q.

A point charge +q is fixed at same height as centre of an uncharged conducting sphere placed on a smooth horizontal surface as shown in figure. Neglect the induced charges on horizontal surface. The conducting sphere is released from rest. Then the conducting sphere.

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a

rolls towards left

b

under goes translational motion towards left

c

rotates about its centre

d

continues to remain at rest

answer is B.

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Detailed Solution

From symmetry of induced charges on sphere, the net electrostatic force Fe on induced charges on sphere due to point charge is along line joining centre of sphere and point charge as shown

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