A charged particle of mass m and charge q is released from rest in an electric field of constant magnitude E. The kinetic energy of the particle after time t is
A
E2q2t22m
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B
2E2t2qm
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C
Eqm2t
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D
Eq2m2t2
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Solution
The correct option is AE2q2t22m Here, u=0,a=Rm=qEmV=u+at=0+qEmtKE=12mv2=mq2R2y22m2=E2q2t22m