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Q.

An electron of mass m  and charge e  is acceleted from rest through a potential difference V in vacuum. Its final speed will be

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a

2 e Vm

b

e  Vm

c

e  V/2m

d

e  V/m

answer is A.

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Detailed Solution

K.E.=  Work done =eV 12 m  υ2=eV    ∴  υ=2 e Vm
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