P15.1 Magnetic fields

Question 1

What is the general rule for the poles?

Answer 1

Like poles repel

Unlike poles attract

Question 2

What are some few examples of magnetic material?

Answer 2

Iron
Cobalt
Nickel

Question 3

Why is Permanent magnets made up of steel and not iron?

Answer 3

Because they do not lose its magnetism easily as iron

Question 4

How can magnetic field lines be seen?

Answer 4

Placing a bar magnet on a piece of paper
Iron filings are sprinkled onto the paper
The region around the magnet is the magnetic field

Question 5

What is the purpose of a plotting compass?

Answer 5

It can be placed onto a magnetic field and align itself along a magnetic field line
Point in a direction away from the N-pole of the magnet and towards the S-pole

Question 6

How can a magnetic material be magnetised?

Answer 6

By placing it in a magnetic field

Question 7

What is an example of induced magnetism?

Answer 7

When an unmagnetised iron rod placed in line with a bar magnet
It becomes a magnet with poles at each end

Question 8

How are the poles different of the induced magnet to the magnet that induced it?

Answer 8

The nearest poles of the induced magnet has opposite polarity of the magnet that has induced it

Question 9

Why does a material attract both N and S poles?

Answer 9

Because it is unmagnetised

Question 10

Why does the unmagnetised material attract both poles?

Answer 10

The unmagnetised material placed in line with a bar magnet becomes a magnet with poles at each end due to it being induced. The nearest poles of the nail and the bar magnet will always have opposite polarity