• # question_answer A charged particle of mass m and charge q is released from rest in a uniform electric field E. Neglecting the effect of gravity, the kinetic energy of the charged particle after 't' second is- A) $\frac{E{{q}^{2}}m}{2{{t}^{2}}}$              B) $\frac{2{{E}^{2}}{{t}^{2}}}{mq}$C) $\frac{{{E}^{2}}{{q}^{2}}{{t}^{2}}}{2m}$          D) $\frac{Eqm}{t}$

${{E}_{k}}=\frac{1}{2}m{{v}^{2}}\,=\,\,\frac{1}{2}m\,{{\left( \frac{qE}{m}t \right)}^{2}}\,\,=\,\,\frac{{{q}^{2}}{{E}^{2}}{{t}^{2}}}{2m}$ $v=at=\frac{qE}{m}t$