What is a neutral point in a magnetic field of a bar magnet.

What is neutral point in a magnetic field ?

What is radial magnetic field ?

Earth's magnetic field is 5xx10^-5 T. A cable is 10 m above the ground. Calculate the current in the cable, so that it may produce a neutral point with earths' magnetic field on the surface of the earth just below it.

The direction of the neutral points is on the equitorial line of a bar magnet, when the north pole of the magnet is pointing towards