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Q.

A charged particle of mass ‘m’ and charge ‘q’ is released from rest in an electric field of intensity E. The kinetic energy of particle after time t is

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a

E2q2t22m

b

Eqm2t

c

2E2t2mgq

d

Eq2m2t2

answer is B.

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Detailed Solution

KE=12mv2

v=u+at

=0+Fm.t    F=qE

v=qEm.t

∴KE=12mqEtm2

=q2E2t22m

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