Physics-
General
Easy

Question

A uniform wire is bent in the form of a circle of radius R. A current I enters at A and leaves at C as shown in the figure :
If the length ABC is half of the length ADC, the magnetic field at the centre O will be

  1. Zero
       
  2. fraction numerator mu subscript 0 end subscript I over denominator 2 R end fraction    
  3. fraction numerator mu subscript 0 end subscript I over denominator 4 R end fraction    
  4. fraction numerator mu subscript 0 end subscript I over denominator 6 R end fraction    

The correct answer is: Zero


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