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The drift velocity of free elecrons in a...

The drift velocity of free elecrons in a conductor is `v`, when a current i is flowing in it. If both the radius and current are doubled, then the drift velocity wil be

A

v

B

`v//2`

C

`v//4`

D

`v//8`

Text Solution

Verified by Experts

The correct Answer is:
B
`v_d=1/("ne"A)=i/("ne"(pir^2))implies v_d prop i/r^2`
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