Physics ✿ magnetism

what happens to the force of a magnet when the poles are:

• similar

• different

• they repel

• they attract

permanent magnet

a magnet that produces and never loses it’s magnetic field

induced magnet

a material that only becomes a magnet when it is placed in a magnetic field

name 4 examples of magnetic material

iron, steel, cobalt and nickel

magnetic field

the region around a magnet where a force acts on another magnet

Explain how a magnetic compass provides evidence that the Earth has a magnetic field. [2]

• the compass always points in the same direction

• as it adjusts itself with the Earth’s magnetic field

where is the magnetic field the most strongest at?

at the poles

what is the direction of the magnetic field lines?

from the north to the south pole

When a current flows through a conducting wire, what is produced around the wire?

a magnetic field

how can one increase the strength of a magnetic field created by a current through a wire?

• shape wire into a solenoid - as it’s magnetic field is strong and uniform

• add an iron core further increases the strength

electromagnet

a solenoid with an iron core

Fleming’s left-hand rule can be used to determine the direction of a force

Complete the labels on Figure 7 to show Fleming’s left-hand rule.

• 1st finger = direction of magnetic field

• middle finger = direction of current

• thumb = direction of force