Two identical wires are bent into separate circular loops

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism

Problem

Two identical wires are bent into separate circular loops. Loop P has radius

5\,\text{cm}

and Loop Q has radius

10\,\text{cm}

. Each loop carries a current of

3\,\text{A}

in the same sense. Find the ratio

\dfrac{B_P}{B_Q}

of the magnetic fields at their centres.