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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 
  • A$\frac{\sigma }{{{\varepsilon _0}lB}}$
  • B$\frac{{{\varepsilon _0}B}}{\sigma }$
  • C$\;\frac{\sigma }{{{\varepsilon _0}B}}$
  • D$\;\frac{{{\varepsilon _0}lB}}{\sigma }$
NEET 2017, Medium
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