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A particle of mass m and charge q is placed at rest in an uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is

1. qE²y
2. qE²y
3. qEy
4. q²Ey

Correct answer: qEy

Solution

The work done by the electric field on the charged particle is equal to the change in its kinetic energy. The work done is given by W = qEy, where q is the charge, E is the electric field, and y is the distance moved. Hence, the kinetic energy attained is qEy.

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