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A uniform rod AB of length a hangs with ...

A uniform rod AB of length a hangs with one end against a smooth vertical wall, being supported by a string of length l, attached to the other end of the rod and to a point of the rod vertically above B. If the rod rests inclined to the wall at angle `theta` then `cos^(2)theta=`

A

`(l^(2)-a^(2))//a^(2)`

B

`(l^(2)-a^(2))//2a^(2)`

C

`(l^(2)-a^(2))//3a^(2)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
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