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

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

KEAMKEAM 2009Electric Charges and Fields

Solution:

K.E acquired = work done
$ =\text { force } \times \text { distance }= qE \times y = qEy $