In: Physics
Solution:
The magnetic lines of force around the conductor are concentric circle. When the current is upwards, the magnetic field is ànticlockwise. When the current is downwards , the magnetic field is clockwise.
(a) When the positive charge is moving along x-axis in the positive direction, the drection of the magnetic field is out of the plane of paper in the y axis.
The current is in +ve x direction, so the magnetic field at +y axis is out of plane of paper.(out of x-y plane)
(b)
The direction of magnetic field at x=3m , y=3m is into the plane of paper.( into the x-y plane)
The direction of magnetic field at x=-3m, y=3m is out of the plane of paper( out of the x-y plane)
(c)
The point x=5m , y=0m lies on the x -axis.
The magnetic field at the point due the conductor in x axis is zero as the point is in the axis of the conductor.
The magnetic filed at the point x=5m, y=0m due to the conductor going along +y axis is into the plane of paper( into the x-y plane )