The wires A and B shown in the figure are made of the same material, and have radii r A and r B respectively. The block between them has a mass m. When the force F is mg/3, one of the wires breaks.
Text Solution
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CHECK THE SOLUTION.
(a, b, c)
Tension in B = T B = mg/3.
Tension in A = T A + T B + mg = 4mg/3.
T A = 4T B .
Stress T/ π π r 2 = S. Wire breaks when S = breaking stress.
For r A = r B , S A = 4S B .
A breaks before b.
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