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Adding and
subtracting
forces
YOU WILL NEED
→ bar magnet
→ 2 ball magnets
→ 2 ring magnets
→ polystyrene disk
→ compass
HERE'S HOW
1. Set the compass on the polystyrene disk
and position the bar magnet as in
Experiment 20.
2. Look for the north pole of the ball
magnet. Hold the ball magnet at the
distance that will make the compass
needle remain halfway between the two
magnets again.
Continued on the next page.
Magnetic Force and Magnetic Fields |
1
2
29
EXPERIMENT 21
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