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One end of a uniform rod of length l and...

One end of a uniform rod of length l and mass m is hinged at A. It is released from rest from horizontal position AB as shown in figure. The force exerted by the rod on the hinge when it becomes vertical is

A

`(3)/(2)mg`

B

`(5)/(2)mg`

C

3mg

D

5mg

Text Solution

Verified by Experts

The correct Answer is:
B
`U_(1)=(1)/(2)QE`
`U_(2)=QE`
`U_(1),U_(2)=1 : 2`
Note : Energy dissipated as heat `=U_(2)-U_(1)=(1)/(2)QE`
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