First slide

Magnetic field due to a current carrying circular ring

Question

A circular loop of radius R carrying current I lies in x-y plane with its centre at origin. The total magnetic flux through x-y plane is

Easy

A

Directly proportional to I
B

Directly proportional to R
C

Directly proportional to $R^{2}$
D

Zero

Solution

Circular loop behaves as a magnetic dipole whose one surface will be N-pole and another will be S-pole. Therefore, magnetic lines a force emerges from N will meet at S. Hence total magnetic flux through x-y plane is zero.

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