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Two large insulating plates having surfa...

Two large insulating plates having surface charge densities `+ sigma` and `- sigma` are fixed some distance apart in a gravity -free region and two ideal insulating springs of force constant k are connected to the plates as shown in the figure. A particle of charge q and mass m which is attached to the junction of the spring is released from rest, then the partice will cross its equilibrium position with a speed

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