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A long wire hangs vertically with its up...

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

A

`pi J`

B

`(pi)/(2)J`

C

`(pi)/(4)J`

D

`(pi)/(8)J`

Text Solution

Verified by Experts

The correct Answer is:
A
`W = (1)/(2) tau phi = (1)/(2) xx 8 xx (pi)/(4) = pi J`
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