First slide

Magnetic field due to a current carrying circular ring

Question

Two concentric coils of 10 turns each are situated in the same plane. Their radii are 20 cm and 40 cm and they carry respectively 0.2 and 0.3 ampere current in opposite directions. The magnetic field (in Wb/m²) at the centre is :

Moderate

A

(35/4)μ₀
B

(μ₀/80)
C

(7/80)μ₀
D

(5/4)μ₀

Solution

Magnetic field at centre = $\frac{μ_{0} I_{1} N_{1}}{2 R_{1}} - \frac{μ_{0} I_{2} N_{2}}{2 R_{2}}$

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