# A student moves a bar magnet into a coil of wire connected to a sensitive ammeter. The ammeter needle deflects, showing a current has been induced. Explain what happens to the induced current when the student moves the same magnet out of the coil at a faster speed than before.

> OCR GCSE Physics A: Gateway Science (J249) — P3.4 Electromagnetic induction · Explain · 4 marks

> A bar magnet is moved into and then out of a coil of wire. The coil is connected to a sensitive ammeter which detects any current flowing.

## Mark scheme (4 marks)

1. The direction of the induced current is reversed (compared to when the magnet was moving in)
2. Moving the magnet out induces a current because the magnetic field through the coil is changing
3. The faster speed means the magnetic field changes more quickly / rapidly
4. The size / magnitude of the induced current is larger / greater

## Key terms

- [induced current](https://www.gradenine.co.uk/glossary/induced-current)
- [coil](https://www.gradenine.co.uk/glossary/coil)

## Related

- [Revision notes for OCR GCSE Physics A: Gateway Science (J249)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/a-student-moves-a-bar-magnet-f7704d38) · Published by Druglandscape Ltd.