A rod of length l and radius r is joined...

A rod of length `l` and radius `r` is joined to a rod of length `l//2` and radius `r//2` of same material. The free end of small rod is fixed to a rigid base and the free end of larger rod is given a twist of `theta^(@)`, the twist angle at the joint will be

`(theta)/(4)`

`(theta)/(2)`

`(5theta)/(6)`

`(8theta)/(9)`

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