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Question: A charged particle of mass m and charge q initially at rest is released in an electric field of magn...

A charged particle of mass m and charge q initially at rest is released in an electric field of magnitude E. Its kinetic energy after time 't' will be –

A

2E2t2mq\frac{2E^{2}t^{2}}{mq}

B

E2q2t22m\frac{E^{2}q^{2}t^{2}}{2m}

C

Eq2m2t2\frac{Eq^{2}m}{2t^{2}}

D

Eqmt\frac{Eqm}{t}

Answer

E2q2t22m\frac{E^{2}q^{2}t^{2}}{2m}

Explanation

Solution

v = u + at

v =

K.E. = 12\frac { 1 } { 2 } mv2 = 12\frac { 1 } { 2 }