Sort each phenomenon by which direction of the electromagnetic connection it demonstrates.
Groups: Electricity produces magnetism · Magnetism produces electricity
- A moving magnet drives a current round a closed loop
- A current-carrying wire deflects a nearby compass needle
- An electromagnet lifts scrap metal when switched on
- A generator turned by a turbine delivers current
- A disk drive head reads data from a spinning magnetic platter
Hints
- Ask what is supplied and what comes out in each case.
- If a current has to be provided first, the effect runs from electricity to magnetism.
Show the answer
Electricity produces magnetism: A current-carrying wire deflects a nearby compass needle, An electromagnet lifts scrap metal when switched on
Magnetism produces electricity: A generator turned by a turbine delivers current, A disk drive head reads data from a spinning magnetic platter, A moving magnet drives a current round a closed loop
Currents create fields, and changing fields create currents, the two directions of one relationship. The disk read head is the payoff for computing: the platter's changing magnetisation induces the tiny voltages that carry back your stored bits.
Practise Magnetism and Electromagnetism
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