topic 6 - magnetism and electromagnetism

Question 1

what charges repel and what charges attract

Answer 1

Opposites attract: North attracts South and South attracts North

Like charges repel: Two Norths will repel each other

Question 2

properties of magnetically hard materials

Answer 2

Permanent magnets are made of magnetically hard materials such as steel. These materials retain their magnetism once magnetised.

Question 3

properties of magnetically soft materials

Answer 3

Some materials like iron are magnetically soft. They lose their magnetism once they are no longer exposed to a magnetic field. They are used as temporary magnets such as electromagnets.

Question 4

what is magnetic field line

Answer 4

• Around every magnet there is a region of space where we can detect magnetism (where magnetic materials will be affected).
• This is called the magnetic field and in a diagram we represent this with magnetic field lines.
• The magnetic field lines should always point from north to south.