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The resistances of three parts of a cir...

The resistances of three parts of a circular loop are as shown in Fig. The magnetic field at the centre O is (current enters at A and leaves at B and C as shown)

A

`(mu_(0)I)/(6a)`

B

`(mu_(0)I)/(3a)`

C

`(2)/(3) (mu_(0)I)/(a)`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
D
No current will flow through section BC as the potentials of points B and C are same. Therefore magnetic field at centre O will be equal and opposite to section AB and AC. Hence, they will cancel out each other.
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