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Question

A uniform rod of length 4L and mass M is suspended form a horizontal roof by two light strings of length L and 2L as shown. Then the tension in the left string of length L is:
951453_22b330fc6f8b4d2cb13aeb44fca102c0.png

A
Mg2
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B
Mg3
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C
35Mg
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D
Mg4
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Solution

The correct option is A Mg2
AC=4L
BC=L
AB=AC2BC2
=(4L)2L2
=16L2L2
=15L2
AB=15L
Also, cosθ=ABAC=AEAD
=15L4L=AE2L
AE=154×2L
AE=152L
taking moment at A
T1×AB=Mg×AE
T1×15L=Mg×152L
T1=Mg2
901448_951453_ans_5d8f8fdb84234ed389c2b9453717c49e.png

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