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Question

A cell is connected between the points A and C of a circular conductor ABCD of centre O with angle AOC=60. If B1 and B2 are the magnitudes of the magnetic fields at O due to the currents in ABC  and ADC  respectively, the ratio B1B2 is 


 
  1. 0.2
  2. 6
  3. 5
  4. 1


Solution

The correct option is D 1


B=μ04πθi4Bθi  (but i1i2=l2l1=θ2θ1)
 B1B2=θ1θ2.i1i2
So, B1B2=θ1θ2×θ2θ1
 B1=B2

 

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