class 12

Missing

JEE Main

Two identical wires A and B, each of length $_{′}l_{′}$, carry the same current I. Wire A is bent into a circle of radius R and wire B is bent to form a square of side ‘a’. If $B_{A}andB_{B}$ are the values of magnetic field at the centres of the circle and square respectively, then the ratio $B_{B}B_{A} $ is : is :