Question

A straight conductor carrying current passes through a rectangular cardboard as shown in the diagram. The magnetic lines of force around point A are in:

Options

• clockwise direction

• anticlockwise direction

• parallel to the direction of conductor

• none of these

Answer 1

Clockwise direction

Explanation:

In the given diagram, the current flows downwards through the conductor. Using the right-hand thumb rule, point the thumb downwards in the direction of the current; the curled fingers show that the magnetic field lines are clockwise when viewed from above. They are concentric circles, not parallel to the conductor.