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Q.

Two light wires A and B shown in the figure are made of the same material, and have radii rA  and  rBrespectively. The block between them has a mass m. When the force F is mg/3, one of the wires breaks.

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a

A will break before B  if rA=rB .

b

Either A or B may break if rA=2rB .

c

The lengths of  A and  B must be known to predict which wire will break.

d

A will break before  B if  rA<2rB.

answer is A, B, C.

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Detailed Solution

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TB=mg/3                            TA=mg+mg/3=4mg/3    
Stress  σ=Tπr2

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