What is electromagnetic induction? Describe an activity with a coil, a magnet and a galvanometer to show it. How can the induced current be increased?

1. 1 · Define it. Electromagnetic induction is the production of a current in a coil when the magnetic field through it changes.
2. 2 · Set up the activity. Wind many turns of insulated wire on a tube and join the ends to a galvanometer.
3. 3 · Draw it. [Sketch: coil joined to a galvanometer G; bar magnet with an arrow moving into the coil]
4. 4 · Observe. Pushing the magnet in deflects the needle; pulling it out deflects it the other way; a still magnet gives no deflection.
5. 5 · Give the factors. Move the magnet faster, use a stronger magnet or use more turns.
6. 6 · Close with a use. A bicycle dynamo and power station generators work on this principle.

Scoring tip: Mention that a still magnet gives no current. This shows you know the field must change, which is the heart of the answer.