A point particle with a charge q is immersed in an electric field and is constrained to move on an equipotential surface. If the constraint has negligible friction, this implies that:

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(c)  none of the other answers are correct

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(d)  the potential energy of the particle remains constant, but its kinetic energy can vary

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(a)  the kinetic energy of the particle remains constant, but its potential energy can vary

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(e)  the mechanical energy of the particle remains constant

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(b)  both the kinetic energy of the particle and the potential energy can vary

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A point particle with a charge q is immersed in an electric field and is constra...

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