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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

A coil of radius 200 mm is to produce a field of 0.4 G in its centre with a current of 0.25 A. How many turns must be there in the coil?

Answer: (B)

Solution

\frac{2rB}{μ_0 I}\frac{2×0.2×4×10^{-5}}{4π×10^{-7}×0.25}$

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Question ID VK-078616