Two circular coils A and B are made from the same copper wire

PHYSICS · Multi-part · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

Two circular coils A and B are made from the same copper wire. Coil A has radius

15\,\text{cm}

and

20

turns, while coil B has radius

10\,\text{cm}

and

30

turns. Each coil carries a current of

4\,\text{A}

. (i) Calculate the ratio of the magnetic field strengths at the centres of coils A and B. (ii) Which coil produces the stronger magnetic field at its centre? Support your answer with the result obtained in part (i).

Related theory

Fields due to Currents
Biot-Savart law
Magnetic field on axis of circular loop
Moving Charges and Magnetism

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