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If the potential difference V applied ac...

If the potential difference V applied across a conductor is increased to 2V with its temperature kept constant,the drift velocity of the free electrons in a conductor will-

A

Remain the same.

B

Become half of its previous value.

C

Be double of its initial value.

D

Become zero.

Text Solution

Verified by Experts

The correct Answer is:
B
Drift velocity is given by :
`v_(d)=(-eE)/(m)tau`
Since `E=(V)/(d)`
`:. V_(d)=(-eVtau)/(md)`
Hence, if potential difference .V is doubled to "2V then:
`v_(d).=(-e(2v))/(md)tau=2v_(d)`
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