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Q.

The negative charge −q2 is fixed, while positive charge q1 as well as the conducting sphere S is free to move (refer figure). If the system is released from rest,

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a

q1 remains at rest, S moves toward left

b

q1 moves toward right while S moves toward left

c

both q1 and S remain at rest

d

both S and q1 move toward left

answer is C.

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Detailed Solution

As the charge q1 is shielded from external charges, Net force on q1 is zero.

While that on the conducting sphere is toward the left due to attraction of −q2.

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