Physics-
General
Easy

Question

The wires A and B shown in the figure are made of the same material, and have radii r subscript A end subscript and r subscript B end subscript respectively. The block between them has a mass m. When the force F is mg/3, one of the wires breaks–

  1. A will break before B if r subscript A end subscript equals r subscript B end subscript    
  2. A will break before B if r subscript A end subscript less than 2 r subscript B end subscript    
  3. Either A or B may break if r subscript A end subscript equals 2 r subscript B end subscript    
  4. The lengths of A and B must be known to predict which wire will break    

The correct answer is: A will break before B if r subscript A end subscript equals r subscript B end subscript

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