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The resistance of a wire is 20 ohm. It i...

The resistance of a wire is `20 ohm`. It is so stretched that the length becomes three times, then the new resistance of the wire will be

A

6.67 ohms

B

60.0 ohms

C

120 ohms

D

180.0 ohms

Text Solution

Verified by Experts

In case of stretching of wire `Rpropto I^2`
`to` If length becomes 3 times so Resistance becomes 9 times i.e., R. = `9 xx 20` = 180 `Omega`
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