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(C) Let the two wires be $1$ and $2$,carrying current $i$ in the same direction. The distance between them is $2r$. The point $P$ is midway between th

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(C) Let the two wires be $1$ and $2$,carrying current $i$ in the same direction. The distance between them is $2r$. The point $P$ is midway between them,so the distance of $P$ from each wire is $r$.According to the right-hand thumb rule,the magnetic field due to wire $1$ at point $P$ is directed into the plane of the paper,given by $B_1 = \frac{\mu_0 i}{2\pi r}$.The magnetic field due to wire $2$ at point $P$ is directed out of the plane of the paper,given by $B_2 = \frac{\mu_0 i}{2\pi r}$.Since the magnitudes are equal and the directions are opposite,the net magnetic field at point $P$ is $B_{net} = B_1 - B_2 = 0$.

Two long straight wires are set parallel to each other. Each carries a current $i$ in the same direction and the separation between them is $2r$. The intensity of the magnetic field midway between them is

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