Question

Which of the following is not true about electromagnets?

• A. The magnetic property is caused due to the flowing current.
• B. Poles can be interchanged.
• C. Electromagnets are temporary magnets.
• D. The magnetic strength cannot be changed.

Answer 1

The correct option is D The magnetic strength cannot be changed.

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Some properties of electromagnet are:

• The magnetic field disappears when the current is turned off.
• It is a temporary magnet.
• The magnetic strength of an electromagnet can be changed by increasing or decreasing the current.
• Poles of an electromagnet can be changed by reversing the direction of the current.