Class practical: a spectacular demonstration showing how magnetic fields interact to produce forces on wires.

Practical Activity 14-16

Demonstration: to demonstrate the motor effect in a wire carrying an electric current.

Practical Activity 14-16

Demonstration: the catapult field seen when two magnetic fields interact can reveal the presence of the Earth's magnetic field...

Practical Activity 14-16

Class practical: this effect is the basis of all electric motors.

Practical Activity 14-16

Demonstration: if students have built their own model electric motor, it is useful if they can see a commercial motor doing a...

Practical Activity 14-16

Class practical: students will be surprised how simple it is to make a loudspeaker, and are likely to remember their need for...

Practical Activity 14-16

Class practical: a moving coil meter makes use of the catapult field.

Practical Activity 14-16

Demonstration: the current balance is a useful meter. Sophisticated versions of it are used in very sensitive current...

Practical Activity 14-16

Class practical: a motor makes use of the catapult field.

Practical Activity 14-16

Magnetism is a non-contact force. For example, a magnetic force can be acting on a paper clip when a magnet is nearby but not...

Physics Narrative 5-11 11-14

The attraction isn’t strong enough to lift large flakes, as each contains only a few magnetic particles. In crushed cereal the...

Enrichment Activity 5-11 11-14

Imagine two bars of iron placed side-by-side on a table. One of them is a bar magnet, the other is not. From the outside it is...

Physics Narrative 5-11