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 :

1. A. 0 ,lB
2. B. 0 ,lB
3. C. 0 ,B
4. D. 0 ,B

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