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A rod PQ mass 'm' and length l can slide...

A rod `PQ` mass `'m'` and length `l` can slide without friction on two vertical conducting semi infinite rails. It is given a velocity `V_(0)` downwards, so that it continues to move downward with the same speed `V_(0)` on its own at any later instant of time. Assuming g to be constant every where, the value of `V_(0)` is :-

A

`(mgR) /(2B^(2)L^(2))`

B

`(mgR)/(B^(2)L^(2))`

C

zero

D

any value

Text Solution

Verified by Experts

The correct Answer is:
B
`(B^(2)V_(0)L^(2))/(R ) = mg implies V_(0)= (mgr)/(B^(2)L^(2))`
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