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A long wire hangs vertically with its up...

A long wire hangs vertically with its upper end clam `A` torque of `8 Nm` applied to the free end twists it through`45^@`. The potential energy of the twisted wire is

A

`piJ`

B

`(pi)/2J`

C

`(pi)/4J`

D

`(pi)/8J`

Text Solution

Verified by Experts

The correct Answer is:
A
`W=1/2tauphi=1/2xx8xpi/4=piJ`
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