Effect of temperature on magnetic strength experiment
Answers
Materials
3 or 4 identical neodymium bar magnets
Tongs
Water
Stove
Pot
Ice
Bowl
Compass
Ruler
Tape
Optional:
Dry ice
Safety glasses
Oven mitts
Procedure
Before testing each magnet:
Set one magnet out on a table so that it reaches room temperature.
Place another magnet in a pot of boiling water for 45 seconds.
Place a third magnet in a bowl of ice water for 30 minutes.
Optional: Using your tongs, oven mitt, and safety glasses, place a fourth magnet in a bucket of dry ice for 30 seconds.
To test the strength of each magnet:
Place the compass on a flat table so that the needle facing right.
Turn the compass so the needle lines up with the ‘0.’ Tape the compass to the table.
Tape the ruler to the table so that its direction is perpendicular to that of the needle. The ‘0’ on the ruler should touch the ‘0’ on the compass.
Take a magnet (using tongs for the heated and cooled magnets) and slide it along the ruler towards the compass. You want the needle to move towards the magnet, so if it is moving away, flip it over.
Take note of the distance between the magnet and the compass when the needle of the compass begins to move. Compare the distances you recorded for all of your magnets. What do you notice? How do you think you can explain your results?
Results
Heating the magnet will cause the magnet to have a weaker magnetic field. Cooling the magnet will cause the magnet to have a stronger magnetic field. Cool magnets can be farther away from the compass than hot magnets when they make the compass’ needle move.
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