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c. The potential difference of O d. The electric field between the plates is halved. e. The charge on the plates does not cha

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Answer #1

The particle is following a circular path this implies that the magnetic force acting on the particle is perpendicular to the motion. So no work is done on the particle by the magnetic force. Hence by work energy theorem, the change in kinetic energy is zero. Hence the kinetic energy remains.

option a is correct.

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