Which of the following conditions are true for obtaining a permanent electromagnet if a current-carrying solenoid is used?

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The current through the solenoid should be a direct current

The rod inside is made up of a magnetic material such as steel

The magnetic material should be of high retentivity

All of the above

answer is D.

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Detailed Solution

The conditions which are true for obtaining a permanent electromagnet if a current-carrying solenoid is used are the current through the solenoid should be a direct current, the rod inside is made up of a magnetic material such as steel, the magnetic material should be of high retentivity.
A solenoid is a basic electromagnetic device made up of a coiled electric wire wound in a 3D circular shape. Whenever an electric current passes through the wire, the solenoid works as a magnet, having N and S poles at the coil's ends. If a ferromagnetic material rod is permanently placed within the solenoid, the metal substantially enhances the magnetic effect and transforms into a permanent electromagnet. Also, by drawing in or pushing out a ferromagnetic object like an iron rod, it can be used as an electrical switch. The switching action occurs based on the direction of the rod and the electrical current.

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