Question

Equal currents i, i are flowing through two infinitely long parallel wires. What will be the magnetic field at a mid-way, when the currents are flowing in opposite directions?

Answer 1

The magnetic field at the mid-point will be twice the magnetic field due to one current carrying conductor because the magnetic fields are equal and in the same direction.

And B = 2 \(\frac{\mu_0 I}{2\pi r} = \frac{\mu_0 I}{\pi r}\)