Two parallel plates carry opposite charges such that the electric field in the space between them is in upward direction. An electron is shot in the space and parallel to the plates. Its deflection from the original direction will be:

upwards

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downwards

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circular

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none of these

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Solution

The correct option is B downwards
Force experienced by electron $= (- e) E = - e E$
$∴$ it is accelerated in downward direction ( opposite of $E$ )
So, its deflection from original direction will be downwards.

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An electron enters the space between the plates of a charged parallel plate capacitor as shown in the figure. The charge density on the plate is σ. Electric intensity in the space between the plates is E. A uniform magnetic field B also exists in the space perpendicular to the direction of E. The electron moves perpendicular to both E and B without any change in direction. The time taken by the electron to travel a distance L in the space is