SME
Grade 8 Science · Problem type
Stronger or weaker magnet?
Use this for “Which change would make the electromagnet stronger?”
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Does the change make the pull stronger or weaker?
Tap a card, then tap its group.
Assumptions
•
Three things set an electromagnet’s strength: turns, current and the core.
•
A better-conducting wire (silver for copper) helps a little; the turns and current matter far more.
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Related lessons
Magnetic fields and electromagnets
Main lesson
Magnetic field lines
Use this for “Draw the field around a bar magnet” and “What does a compass do near a magnet?”
Paper clips by turns of wire
Use this to record how many clips your electromagnet lifts with more turns.
Magnetic pull by distance
Use this to record how a magnet’s pull falls as it moves away.