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Increasing Electromagnet Force
Figure 7 shows an electromagnet close to a permanent magnet.
Give two changes to the electromagnet that would increase the force exerted on the permanent magnet.
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Marking points
- 1 Gives a first valid change: decrease separation, add coil turns, or increase current/potential difference.
- 2 Gives a second distinct valid change from the official alternatives.
Full-mark answer
1. Add more turns to the coil. 2. Increase the current through the coil.
Why this answer loses marks
Use a stronger magnet.
The question asks for changes to the electromagnet. Credit is given for moving it closer, adding turns to its coil, or increasing its current/potential difference.