Two parallel beams of protons and electrons, carrying equal currents are fixed at a separation d. The protons and electrons move in opposite directions. There is a point P on the straight perpendicular line joining the two beams at a distance x from one beam. The magnetic field at this point is B. If B is plotted against x, it can be represented by the curve.

Options

A.
B.
C.
D.

Answer

C

Explanation

At mid point field is zero closer to protons `to` inward and closer to electrons `to` outward