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Question

A man and a child are holding a uniform rod of length L in the horizontal direction in such a way that one fourth weight is supported by the child. If the child is at one end of the rod then the distance of man from another end will be :

A
3L4
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B
L4
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C
L3
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D
2L3
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Solution

The correct option is C L3
balancing the force F=mgmg4=3mg4
Balancing torque about A
mgl2=3mg4(lx)2l=3(lx)x=l3
220489_138340_ans_3368dbbb317e4d5ab236abf8b8aa3f02.JPG

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