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The electric resistance of a certain wir...

The electric resistance of a certain wire of iron is R . If its length and radius are both doubled, then

A

Will be doubled and the specific resistance will be halved

B

Will be halved and the specific resistance will remain unchanged

C

Will be halved and the specific resistance will be doubled

D

And the specific resistance both will remain unchanged

Text Solution

Verified by Experts

The correct Answer is:
B
`R = (rho L)/(A)` and `rho` is independent of geometry changes
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