Question

What is an electromagnet? What material are used to make electromagnet? How electromagnet differs from permanent magnet?

Answer 1

Answer:

Explanation:An electromagnet is basically a metal (which can be easily magnetised) around which a conducting coil is wrapped. When current is passed through the coil, a magnetic field is produced around it, magnetising the metal. The magnetic field lines produced shows a similar pattern as those of a bar magnet (permanent magnet).

Although the magnetic field lines are similar in both cases, yet they are not the same. The difference in the two magnets are:

i> The polarity of electromagnet can be changed by reversing the direction of current.

ii> The strength of magnetic field produced can be increased in electromagnet, either by increasing the number of turns of coil around the conductor, or by increasing the strength of current in coil.

iii> An electromagnet can be easily demagnetised by switching off the current.

These three advantages of electromagnets are not possible in a permanent magnet

Answer 2

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An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil.

A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field.

An electromagnet is made from a coil of wire which acts as a magnet when an electric current passes through it.