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Question

If Ohm's law is presumed to be valid, then drift velocity Vd and electric field E are related as

A
vdE2
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B
vdE
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C
vdE
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D
vdE0
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Solution

The correct option is B vdE
The force on electron due to applied electric field is: F=eE.
If m is the mass of electron, then acceleration produced is given by: a=Fm=eEm.
If t is the average time interval then drift velocity of electron is: vd=at=eEmt
Thus, vdE

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