Physics-
General
Easy

Question

Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

  1. mu subscript o end subscript i divided by r    
  2. 4 mu subscript o end subscript i divided by r    
  3. Zero    
  4. mu subscript o end subscript i divided by 4 r    

The correct answer is: Zero


    At P
    rightwards double arrow B subscript n e t end subscript equals B subscript 1 end subscript minus B subscript 2 end subscript
    Since open vertical bar B subscript 1 end subscript close vertical bar equals open vertical bar B subscript 2 end subscript close vertical bar
    So, Bnet = 0

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