The resistances of three parts of a circular loop are as shown in the figure. The magnetic field at the centre O is
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a
μ0I6a
b
μ0I3a
c
32μ0Ia
d
zero
answer is D.
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Detailed Solution
No current will flow through section BC as the potential of point B and C are same, hence magnetic field at centre O will be equal and opposite due to section AB and AC and hence cancel out.