Question

The mass of an electron is m, charge is e and it is accelerated from rest through a potential difference of V volts. The velocity acquired by electron will be
a)√[V/m]
b) √[eV/m]
c) √[2eV/m]
d) Zero

[Ans:(c)]

Answer 1

Hi there...!

Work done = e*V

this work is stored in the form of Kinetic energy ,
(0.5)mv² = e*V

V =√[2eV/m]

Hope this helps you...!!

Answer 2

Hi friend,

# c) root [ 2eV/m ]

Explanation :-

Kinetic energy of electron accelerated through a potential.

Thus, e = Ve

=> 1/2 mv^2 = eV

=> v^2 = 2ev/m

=> V = root 2ev/m

.....i hope it helps you


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