The radius of a circular coil is doubled while the current through it remains unchanged

PHYSICS · Single correct · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current

Problem

The radius of a circular coil is doubled while the current through it remains unchanged. How does the magnetic field at its centre change? (a) It becomes one–fourth of the original value. (b) It becomes double the original value. (c) It becomes half of the original value. (d) It remains unchanged.

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