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The resistance of a wire is 10 ohm. The ...

The resistance of a wire is 10 ohm. The resistance of a wire whose length is twice and the radius is half, if it is made of same material is

A

`20 Omega`

B

`5 Omega`

C

`80 Omega`

D

`40 Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
`R_(1)/R_(2) =l_(1)/l_(2) xx r_(2)^(2)/r_(1)^(2)`
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