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in Physics by (63.3k points)
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The wires A and B shown in the figure are made of the same material and have radii rA and rB respectively. The block between them has a mass m. When the force F is mg/3, one of the wires break

(a) A will break before B if rA = rB 

(b) A will break before B if rA < 2rB

(c) Either A or B may break if rA = 2rB

(d) The lengths of A and B must be known to predict which wire will break

1 Answer

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by (67.9k points)
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Best answer

Correct option  (a,b,c)

Explanation:

When force F = mg/3 is applied at the lower end then

i.e. stress in wire A = stress in wire B. It means either A or B may break.

(iii) If A B r < 2r then stress in A will be more than B. i.e. A will break before B. 

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