Instructions

Project #4
Be a Magician
Build the circuit as shown and drop
the thin rod into the electromagnet
(M3). Push the press switch (S2)
several times. The thin rod gets
sucked into the electromagnet and
can be suspended there, or you can
bounce it up and down.
When you push the press switch, the
thin rod gets sucked up and wiggles
up and down until settling in position
just below center. Measure how high
you get the thin rod to go, then try
with old and brand new batteries.
Also try adjusting the height of the
electromagnet.
Part B: With the switch pressed and
the thin rod suspended in mid-air,
hold the magnet near the thin rod.
Notice that one side of the magnet
repels the thin rod but the other side
attracts it.
Magnet - magnetic field
Battery - electric field
N
Part A: Secure the magnet in
place with nothing beneath it. Tie
a paper clip to some string and
place it on the magnet. Slowly
pull the string away so the paper
clip is suspended in air. Hold the
paper clip in place with a weight,
as shown.
Next, hold the magnet near the
paper clip and lift it off the ground,
without it touching the magnet.
Move it around in mid-air.
Part B: Build the circuit shown
and place the iron core rod in the
electromagnet (M3). Secure the
paper clip-string with a weight
above the circuit, as shown. Push
the press switch (S2) to pull the
paper clip towards the
electromagnet. Attract and
release the paper clip by pressing
and releasing the switch.
A magnet has a magnetic field,
and a battery has an electric
field. The north and south poles
of a magnet are comparable to
the positive and negative
terminals of a battery.
Electric and magnetic fields
affect each other. If you place a
magnet next to a radio your
reception can be disturbed.
S
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Project #3
Electromagnet Tower