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Magnetic force for SQA National 5 Physics

Magnetic force

This page covers the following topics:

1. Attraction and repulsion, dipoles

Magnetic forces are non-contact forces. Magnets can be attracted to or repel other magnets.

Attraction and repulsion, dipoles

1

Forces of attraction and repulsion allow us to use a plotting compass to see which direction is north and which is south. This happens due to non-contact forces between what two magnets?

the bar magnet in the compass and the magnet at Earth's centre

Forces of attraction and repulsion allow us to use a plotting compass to see which direction is north and which is south. This happens due to non-contact forces between what two magnets?

2

What are the units used for non-contact forces?

Newtons/N (the same as any force)

What are the units used for non-contact forces?

3

Why is magnetic force a non-contact force?

Magnetic force can be exerted between objects without them touching each other.

Touching is not necessary.

Why is magnetic force a non-contact force?

4

What is the definition of a dipole?

A dipole is a pair of equal and oppositely charged or magnetised poles separated by a distance.

What is the definition of a dipole?

5

Forces that are not non-contact are called contact forces. Give the definition of a contact force.

A contact force is a force that exists only between several objects that touch each other.

Forces that are not non-contact are called contact forces. Give the definition of a contact force.

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