A current I 0 flows through a metallic circular loop of radius r as shown in the figure. Resistance of the segment ABC is half that of ADC . Magnitude of magnetic field at the centre O of the loop is:

1. A. 0 I 0 12r
2. B. 0 I 0 4r
3. C. 0 I 0 2r
4. D. 0 I 0 2 r

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