A block having mass m and charge q is resting on a frictionless plane at a distance L from the wall as shown. A uniform electric field E is switched on as shown. If the collision of the block with wall is perfectly elastic, the time taken by the block to return to the initial position is

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2mLEq

2πmLEq

22mLEq

mLEq

answer is C.

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Detailed Solution

a = qEmtowards rightTime taken to hit the wallt = 2La Time to come back = 2t22LMqE

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