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in Physics by (63.3k points)

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 θ, the twist angle at the joint will be

(a)  θ/ 4

(b)   θ/2

(c)   5θ/ 6

(d)   8θ/ 9 

1 Answer

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Best answer

Correct option (d)   8θ/ 9 

Explanation:

If torque τ is applied at the free end of larger rod and twist θ is given to it then twist at joint is θ1 and twist at the upper end (fixed base) θ2

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