Different shapes of conductors have different type of magnetic field.
• Take a straight thick copper wire and place it between the points X and Y in an electric circuit. The wire XY is kept perpendicular to the plane of the paper.
• Horizontally place a small compass near this copper wire. See the position of its needle.
• Pass the current through the circuit by inserting the key into the plug.
• Observe the change in the position of the compass needle and the direction of deflection.
• Interchange the battery connection in the circuit so that the direction of the current in the copper wire changes.
• Observe the change in the direction of deflection of the needle.
