SME
Grade 8 Science · Problem type
Magnetic field lines
Use this for “Draw the field around a bar magnet” and “What does a compass do near a magnet?”
Explore
The lines crowd at the poles, where the field is strongest.
Assumptions
•
A magnetic field fills the space round a magnet. It pushes or pulls on iron and other magnets without touching them.
•
Field lines leave the north pole and go round to the south pole. Where they crowd together the field is strongest.
•
A compass needle’s north end points along the field.
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Related lessons
Magnetic fields and electromagnets
Main lesson
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.
Stronger or weaker magnet?
Use this for “Which change would make the electromagnet stronger?”