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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 6 N-m, applied to its free twists it through an angle of `30^(@)`. The potential energy of the twisted wire is

A

0.57 J

B

1.57 J

C

2.5 J

D

3.5 J

Text Solution

Verified by Experts

The correct Answer is:
B
`P.E. = (1)/(2) T theta = (1)/(2) xx 6 xx (pi)/(6) = (pi)/(2) = (3.14)/(2) = 1.57 J`
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