In a region of uniform electric field of intensity $E$, an electron of mass $m_e$ is released from rest. The…
In a region of uniform electric field of intensity $E$, an electron of mass $m_e$ is released from rest. The distance travelled by the electron in a time $t$ is
$\frac{2 m_e t^2}{e}$
$\frac{e E t^2}{2 m_e}$
$\frac{m_e g t^2}{e E}$
$\frac{2 E t^2}{e m_e}$
Solution
$a=\frac{F}{m_e}=\frac{e E}{m_e}$ As, $S=\frac{1}{2} a t^2=\frac{1}{2} \frac{e E}{m_e} t^2$