Question

A long, vertical wire carrying a current of 10A in the upward direction is placed in a region where a horizontal magnetic field of magnitude 2.0 x l0^-3T exists from south to north. Find the point where the resultant magnetic field is zero.

Answer 1

i = 10A. (K)

B = 2 × 10^–3T South to North (J)

To cancel the magnetic field the point should be choosen so that the net magnetic field is along  -J direction.

∴ The point is along -i direction or along west of the wire.