Question

13.An electron of mass m kg and having a charge of e coulombs travels from rest through a potential difference of V volts. Its kinetic energy will be ?

Answer 1

As we know ,
Work done W = e×V (e = charge on electron, V =potential difference)

Since, this work is stored in the form of Kinetic energy , 
(0.5)mv² = e×V will the kinetic energy
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Answer 2

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