Simple Phenomena of Magnetism

Front

What are the two poles of a magnet?

Back

North Pole and South Pole

Front

How do these different poles of the

magnet interact?

Back

Like poles repel, unlike poles attract each other.

Front

What is a permanent magnet?

Back

• -A magnet that can produce its own magnetic

field and will repel and attract other magnets

when it is in contact with them

-It is made from a magnetic material

- It cannot be demagnetised

Front

Explain what a hard magnetic material is.

Back

Hard magnetic materials get magnetised when an

external magnetic field is applied and stay

magnetised permanently when the external field is

removed.

Front

Explain what a soft magnetic material is.

Back

Soft magnetic materials get magnetised when an

external magnetic field is applied but they get

demagnetised (lose their magnetic field) when the

external field is removed.

Front

Name four magnetic materials.

Back

1. Iron

2. Cobalt

3. Nikel

4. Steel (Iron+Carbon)

Front

What is a magnetic field?

Back

A region of space around a magnet or electric current in which a magnetic pole experiences a force.

Front

Which direction do the field lines in a

magnetic field point?

Back

From north to south.

Front

State two methods by which a piece of unmagnetized steel can be mgnetised.

Back

1. 1. By stroking it with a permanent magnet

2. 2. Place the material in a strong magnetic field as produced by an electromagnet

Front

State three methods by which a piece of magnetized steel can be demagnetised

Back

1. 1. Hammer the magnet

2. 2. Place the magnet in the field of an electromagnet that is connected to an a. c.

3. 3. Heat the magnet