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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. 1
  4. 5


Solution

The correct option is C 1
B=μ04π.θir
Bθi
B1B2=θ1θ2×i1i2
Also i1i2=l2l1=θ2θ1 Hence B1B2=11

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