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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

A circular coil of radius 40 mm consists of 250 turns of wire in which the current is 20 mA. The magnetic field in the centre of the coil is

Answer: (A)

Solution

\dfrac{μ_0NI}{2r}\dfrac{4π×10^{-7}×250×0.02}{2×0.04}10^{-5}$

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Question ID VK-078286