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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

`20Omega`

B

`5Omega`

C

`80Omega`

D

`40Omega`

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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