ElectrostaticsHard

Question

An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electrical field is now reversed, keeping its magnitude the
same. A proton is allowed to fall from rest in through the same vertical distance h. The time fall of the electron, in comparison to the time fall of the proton is :-

Options

A.

smaller

B.

5 times greater

C.

10 times greater

D.

equal

Solution

S=ut+12at2h=0+12qEmt2t=2hmqEtm
as mass of proton is heavier than electron, hence electron will take less time.

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