Difference between Electromagnets and Permanent Magnets

Q.

_______ is the property of magnet by which it attracts iron pieces or other magnetic materials.

1. Electrolysis

2. Galvanisation

3. Conduction

4. Magnetism

Q. Identify the substance that is easy to magnetize and demagnetize?

1. Steel
2. Alnico
3. Soft Iron
4. Cobalt

Q. Can electricity flow on magnet ?

Q.

The visual below give the simple circuit used to make an electromagnet. Examine the visual and answer the question that follows:-

What is an electromagnet?

Q.

Which of the following gets demagnetised when a powerful magnet is kept near it?

1. Plastic ruler

2. Glass tumbler

3. Compact disc

4. Wood

Q.

How is a permanent magnet is different from an electromagnet?

Q. Electromagnets are permanent magnets.

1. False
2. True

Q. Electromagnets are used to concentrate _______ ores :

1. mercury
2. copper
3. Iron
4. sulphur

Q.

Statement 1: Electromagnets are permanent magnets.
Statement 2: We can change the strength of an electromagnet.

Q.

A magnet made by using electric current is called _______