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  4. In a region of uniform electric field of intensity E , an electron of mass me is released from rest. The distance travelled by the electron in a time t is

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Q. 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

EAMCETEAMCET 2015

Solution:

The force on electron in the electric field
$F =e E $
$\therefore $ Acceleration, $ a =\frac{F}{m_{e}}=\frac{e E}{m_{0}}$
Now, from equation of motion,
$S=\frac{1}{2} a t^{2}=\frac{1}{2} \frac{e E}{m_{e}} t^{2}$
where, $t=$ time