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General
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Question

Two thin long parallel wires separated by a distance b are carrying a current i amp each. The magnitude of the force per unit length exerted by one wire on the other is

  1. fraction numerator mu subscript 0 end subscript i to the power of 2 end exponent over denominator b to the power of 2 end exponent end fraction    
  2. fraction numerator mu subscript 0 end subscript i to the power of 2 end exponent over denominator 2 pi b end fraction    
  3. fraction numerator mu subscript 0 end subscript i over denominator 2 pi b end fraction    
  4. fraction numerator mu subscript 0 end subscript i over denominator 2 pi b to the power of 2 end exponent end fraction    

The correct answer is: fraction numerator mu subscript 0 end subscript i to the power of 2 end exponent over denominator 2 pi b end fraction

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