An electron moves straight inside a charged parallel plate capacitor of uniform change density $$\sigma$$ 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

$$\frac{\epsilon_0 lB}{\sigma}$$

B

$$\frac{\sigma}{\epsilon_0 lB}$$

C

$$\frac{\epsilon_0 B}{\sigma}$$

D

$$\frac{\sigma}{\epsilon_0 B}$$