Question

The strength of the magnetic field between the poles of an electromagnet would be unchanged if ______.

Options

• current in the electromagnet winding were doubled.

• direction of current in electromagnet winding were reversed.

• distance between the poles of electromagnet were doubled.

• material of the core of electromagnet were changed.

Answer 1

The strength of the magnetic field between the poles of an electromagnet would be unchanged if direction of current in electromagnet winding were reversed.

Explanation:

Reversing the direction of the current only changes the magnetic polarity (swapping the north and south poles) of the electromagnet. It does not affect the magnitude or intensity of the magnetic field. In contrast, changing the current, pole distance, or core material directly alters the magnetic field strength.