A long straight wire in the horizontal plane carries a current of 50 A in North to South direction.Give the magnitude and direction of Bat a point 2.5 m East of the wire.
Here, the point P is in the East direction from the wire which is placed in North-South direction and in the horizontal plane.
Given, I = 50 A and r = 2.5 m
The magnitude of magnetic field,
The direction of magnetic field at point P is given by right hand thumb rule. The current flows from North to South, i.e. downwards, then the direction of magnetic field at P is perpendicularly outwards to the plane of paper.