First slide

Magnetic field due to a current carrying circular ring

Question

The magnetic field at the centre of a current-carrying circular coil depends on the radius R of the coil as :

Moderate

A

R
B

R²
C

1/R
D

1/R²

Solution

Magnetic field due to circular wire at its center is given by $\frac{μ_{0} i}{2 R}$
Hence magnetic field is inversely proportional to radius of coil

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