Question

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

A
qEy2
B
qE2y
C
qEy
D
q2Ey

Solution

## The correct option is B $$qEy$$According to work-energy theorem:Kinetic energy attained by the particle is equal to work done on the particle by electric field$$\therefore K.E.=(q E)y$$PhysicsNCERTStandard XII

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