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MHT CET 2023 (13 May, Shift 1) · Biot-Savart Law & Circular Coils

Biot-Savart Law & Circular Coils question from MHT CET 2023 (13 May, Shift 1)

Q50MHT CET 2023 · 13 MAY · SHIFT 1Easy

Biot-Savart Law & Circular Coils

Two concentric circular coils A and B have radii $20\text{ cm}$ and $10\text{ cm}$ respectively lie in the same plane. The current in coil A is $0.5\text{ A}$ in anticlockwise direction. The current in coil B so that net field at the common centre is zero, is

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Answer: (c)

For zero net field: $\frac{I_A}{r_A} = \frac{I_B}{r_B}$ with opposite directions.
$I_B = 0.5\times\frac{10}{20} = 0.25\text{ A}$ , flowing opposite to A, i.e. clockwise.
So the answer is (c) 0.25 A clockwise.

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