- Show pupils examples of solenoid coils acting as electromagnets,
eg bell, buzzer, relay, etc. Ask them to make a coil,
eg from insulated wire around a wooden dowel, and connect it to a low-voltage power supply and observe effects.
- Ask pupils to plan how to investigate the factors that affect the strength of an electromagnet. They could use iron cores or soft iron nails. Remind them of their investigation into the strength of the magnets they made. Discuss the best way of obtaining and presenting results so that conclusions can be drawn. Ask them to consider the limitations in their findings,
eg range and precision of results, and to suggest improvements by comparing their methods with those of others.
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- identify the factors that affect the strength of an electromagnet
- make an electromagnet
- make appropriate measurements and present data in a suitable form to draw conclusions
- identify strengths and weaknesses in their own methods
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