# A straight conducting wire is moved downwards through a magnetic field. A small current is detected in the wire. Explain why a current is produced and describe two ways the student could increase the size of the induced current.

> Eduqas A-Level Physics — 4.5 Electromagnetic induction · Explain · 5 marks

> A straight conducting wire is held between the poles of a horseshoe magnet. When the wire is moved downwards, a sensitive galvanometer connected to the wire shows a reading.

## Mark scheme (5 marks)

1. Moving the wire cuts through (or moves through) the magnetic field lines / the wire cuts the magnetic flux
2. This induces (or generates) a potential difference / voltage across the wire
3. This potential difference drives a current around the circuit (through the galvanometer)
4. Move the wire faster (through the magnetic field) to increase the induced current
5. Use a stronger magnet to increase the induced current

## Key terms

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

## Related

- [Revision notes for Eduqas A-Level Physics](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-straight-conducting-wire-is-moved-bce57f1a) · Published by Druglandscape Ltd.