SME
Grade 8 Science · Problem type
Paper clips by turns of wire
Use this to record how many clips your electromagnet lifts with more turns.
Record and look
2
4
6
9
11
10 turns
20 turns
30 turns
40 turns
50 turns
10 turns
20 turns
30 turns
40 turns
50 turns
Clips picked up (clips)
2
4
6
9
11
From 2 clips at 10 turns to 11 at 50: more turns, a stronger electromagnet.
Tap a bar at the height you want.
Assumptions
•
Wind the same wire round the same nail, keep the same battery, and count the clips it lifts.
•
Change only the turns: a fair test.
•
Wire warms up; disconnect between trials.
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