Magnetism

Question 1

Magnetic materials

Answer 1

Iron, (steel as well as it contains iron), nickel and cobalt

Question 2

Describe the interactions between like / unlike poles

Answer 2

Like poles repel

Opposites attract

Question 3

Rules of drawing field lines

Answer 3

1. The closer the lines are together , the stronger the field
2. The lines NEVER touch OR cross

ARROWS NORTH TO SOUTH
(ANTS)

Question 4

Magnetic domains

Answer 4

When domains are aligned the material is a PERMANENT MAGNET with a North and South Pole
If you DROP a magnet you can DE-MAGNETISE it because you cause the domains to become unaligned.

Question 5

Earth’s magnetic field

Answer 5

Same as a bar magnet

Question 6

Describe how to create a magnet, and an electromagnet

Answer 6

1. Placing a magnetic material next to a strong permanent magnet will cause the domains to align over time
2. We can also create a permanent magnet by stroking a magnetic material with a permanent magnet
3. Wrap the magnetic material I.e iron nail , in a wire (solenoid) and pass electricity through the wire. The iron nail will become an electromagnet

Question 7

How to increase the strength of an electromagnet

Answer 7

1. Wind the wire into a coil to strengthen the magnetic field
2. Put an iron nail inside
3. Increase the current flowing through the wire