An electron moves straight inside a charged parallel plate capacitor of uniform charge density. The space between the plates is filled with uniform magnetic field of intensity $B ,$ as shown in the figure, Neglecting effect of gravity, the time of straight line motion of the electron in the capacitor is
NEET 2017, Medium
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$F _{ E }= F _{ B }$
$eE = evB$
$E =\frac{l}{t} B$
$t =\frac{l B \varepsilon_{0}}{\sigma}$
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