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Unit 11: Magnetism Page 25
galvanometer detecting a change wire should be connected to the
in the magnetic field, it is actually other end of the galvanometer.
measuring electrical current! So,
now that you’ve made one let’s use 4. Now move your magnet in and
it! out of the coil. Can you see the
compass move? Does a stronger or
More experiments with weaker magnet make the compass
your galvanometer: move more? Does it matter how
fast you move the magnet in and
You will need: out of the coil?
· Your handy galvanometer Taa Daa!!! Ladies and gentlemen
· The strongest magnet you you just made electricity!!!!! You
own also just recreated one of the most
· Another 2 feet or more of important scientific discoveries of
wire all time. Moving electrons create a
· Toilet paper or paper towel magnetic field and moving
tube magnetic fields can create electric
currents.
1. Take your new piece of wire and
remove about an inch of insulation Experiment: Electromagnet
from both ends of the wire.
You can also wrap your wire
2. Wrap this wire tightly and around an iron core (like a nail),
carefully around the end of the which will intensify the effect and
paper towel tube. Do as many magnetize the nail enough for you
wraps as you can while still leaving to pick up paperclips when it's
about 4 inches of wire on both hooked up. See how many you can
sides of the coil. You may want to lift!
put a piece of tape on the coil to
keep it from unwinding. Pull the Find these materials:
coil from the paper towel tube,
· Batteries in a battery holder
keeping the coil tightly wrapped.
with alligator clip wires
3. Hook up your new coil with your · A nail that can be picked up
galvanometer. One wire of the coil by a magnet
should be connected to one wire of · At least 3 feet of insulated
the galvanometer and the other wire (magnet wire works
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