Question

Which of the following is not true about electromagnets?

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

Answer 1

The correct option is C 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.