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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 B1/B2 is 

(a) 0.2 

(b) 6 

(c) 1 

(d) 5

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