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1. What kind of motion worked best
at inducing voltage?The “Left-Hand Rule” can be used to predict which way current will move through the coil. If the north face of a magnet is approaching a coil, the left hand’s thumb is pointed in the same direction, and the fingers wrap to give the current direction. Try to use this to confirm the theory based on the sign of the voltage induced in the meter.Lab 23 – Induction:
Purpose
Students will experiment with and
analyze magnetic induction.
Theory
When a magnetic field changes in
strength as it passes through a coil, a
current will be induced that becomes a
voltage difference at the ends of the
coil. This happens only if the B-field
changes relative to the coil. A constant
field produces no such effect.
Lenz’s Law comes into play: a coil
will induce a current to fight the field’s
change. If the magnet is getting closer,
the coil current circles to make a field
in the opposite direction. If the field is
instead growing weaker, the current is
directed to reinforce that field.
Technically speaking, this effect is
magnetic force if the coil is in motion,
or Faraday’s Law if the magnet moves.
Procedure
1. Get or rebuild the coil made in Lab
22 on magnetomotive force.
Figure 23: Each sanded coil end can either
be twister around the probe spirally or else
wrapped once and then twisted to itself.
2. Wrap one of its sanded lead ends
around one of the probe tips of the
multimeter and one around the other.
3. Turn on the multimeter and set it
on the lowest voltage setting.
4. Take the disk magnets from the kit
and try inducing voltage through the
coil by moving the magnets in various
ways including face-first and edge-first
approaches to the coil, flipping over
next to the coil, and anything else that
comes to mind.
5. Note that any voltage induced will
last only for a moment since a still
magnet won’t induce anything. Test it
by setting the magnet in the middle of
the coil and observing.
Analysis
1. What kind of motion worked best
at inducing voltage? (If nothing works,
it is probably due to bad contact where
the coil ends are touching the probes.)
2. The “Left-Hand Rule” can be used
to predict which way current will move
through the coil. If the north face of a
magnet is approaching a coil, the left
hand’s thumb is pointed in the same
direction, and the fingers wrap to give
the current direction. Try to use this to
confirm the theory based on the sign of
the voltage induced in the meter. (If the
current enters the red probe in the V
socket, + is shown. If it enters the black
probe in the COM socket, – is shown.)
Does it work?

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