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Q.

An electron of mass m, initially at rest moves through a certain distance in a uniform electric field in time t. A proton of mass M, also initially at rest, takes time T to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio Tt is nearly equal to

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a

Mm

b

2Mm

c

Mm

d

mM

answer is C.

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Detailed Solution

a=eEm since l=12at2=12a'T2  Tt=aa'=eE/meE/M=Mm

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