Question

A coil is held in a magnetic field, such that plane of the coil is at right angles to that of the plane of permanent magnet. The force experienced by the coil on the passage of electric current will be:

Options

• maximum

• zero

• weak

• none of these

Answer 1

Zero

Explanation:

When the plane of the coil is perpendicular to the magnetic field, the net force or turning effect on the coil is zero. The forces on opposite sides are equal and opposite, so they cancel out. The maximum turning effect occurs when the coil's plane is parallel to the magnetic field.