Question

Which of the following is not true about electromagnets?

OPTIONS

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

Answer 1

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C. The magnetic strength cannot be changed. ✔️

An electromagnet is a type of magnet which the magnetic field is produced by an electric current. The magnetic field disappeares gradually when the current is turned off. Hence, it is a temporary magnet. The magnetic strength of an electromagnet can be changed by increasing or decreasing the current or changing the core. Poles of an electromagnet can be changed by reversing the direction of the current. Electromagnet usually consists of wire wound into a soft iron core.

Answer 2

$\huge\bf{Answer:-}$

"The magnetic strength cannot be changed" this is the only right sentences in all the given options.