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Question

Two uniform rods of equal length but different masses are rigidly joined to form an L shaped body, which is then smoothly pivoted about O as shown. If the body is in equilibrium in the shown configuration, ratio M:m will be :

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A
2
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B
3
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C
2
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D
3
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Solution

The correct option is D 3
Torque due to both the rods about pivot point O will be equal and opposite.
τmg=τMg
mg×l2sin600=Mg×l2sin300
mg×l2×32=Mg×l2×12
Mm=3

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