16 Mar 2018
Jason Roark, Johanna Cannon, Nick Haywood
Conclusion Part 1 Using an induction coil and a magnet, Faraday’s Law can be
demonstrated by measuring the change in voltage when a magnetic field is moved near
the induction coil. Before we started the experiment, we made a guess that our
induction coil was wound counter-clockwise from positive to negative leads. The coil
would attract the magnetic north end of the compass (calibrated away from magnets
with the planets magnetic poles) when placed nearby. Given this, we believe the EMF
generated by our magnet pole will be positive. This is because our induction coil is
generating a negative magnetic field that attracts the north pole of our magnet, and due
to Faraday’s Law of Induction the EMF generated must be opposite our magnetic field.
Given that our voltage started with a maximum peak, we can induce that our inductor
is wound counter-clockwise from positive to negative leads.
When we included the iron bar with the inductor, the change in voltage was much more
extreme. The voltage increased much more than it decreased, so we can see that
including the iron bar increased the strength of the magnetic field in the inductor.
Inductor with iron bar in the middle
Part II In this portion of the lab, we placed two inductors next to each other that were
connected to current/voltage probes, then measured how distance between the two
inductors would change the magnetic field around them. No space between the
Space between the
Potential change as distance
As the graphs show, the potential changes (decreases) as the inductors are moved
further apart. This is due to the magnetic field being weakened by the increase of
distance. This makes sense theoretically as well, since distance is in the denominator
of the magnetic field equation.
Part III In this part of the lab, we looked at the use of electrical current to create
motion. We held the inductor in each of our hands and connected it to the power
amplifier. Then we set the inductor down with the iron bar flush against its side. It is
feasible to believe that a strong enough electric current can create motion. Due to our
observations, we can conclude that if a strong enough current is present it can create
motion because of the energy within that current.
Purchase answer to see full