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A potential difference V is applied acro...

A potential difference V is applied across a coper
wire of diameter d and length l. When d is doubled,
the drift velocity:-

A

`v_(d)`

B

`2v_(d)`

C

`v_(d)//2`

D

`v_(d)//4`

Text Solution

Verified by Experts

The correct Answer is:
C
`I = "ne"Av_(d) = v_(d) = I/("ne"A) = (IR)/("ne"AR) = V/("ne"A(rhol)/A)`
`rArr v_(d) = V/("ne"rhol) rArr v_(d) prop 1/l`
If `l. to 2l`, then `v_(d) rArr v_(d)//2`
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