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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 :

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(35/4)μ0

(μ0/80)

(7/80)μ0

(5/4)μ0

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detailed solution

Correct option is D

Magnetic field at centre = μ0I1N12R1-μ0I2N22R2

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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 :

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Ready to Test Your Skills?

free study material

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 :