New York UniversityPHYS - UAPHYS - UA 2: Lab Section 9 Experiment performed 6 April 2017 Electromagnetic induction experiment.
Introduction
This experiment involves inducing an electromotive force on a coil by moving a
...
New York UniversityPHYS - UAPHYS - UA 2: Lab Section 9 Experiment performed 6 April 2017 Electromagnetic induction experiment.
Introduction
This experiment involves inducing an electromotive force on a coil by moving a magnet, moving
a second coil, and changing the current in the second coil relative to the first coil. This time
changing magnetic field should induce a current to flow.
Description
A voltage sensor is utilized with two leads to measure the potential difference across a coil and
across an RLC circuit board. Three different set ups are used to see how the induced
electromotive force varies. A voltmeter is used to measure the change in voltage across the coils.
Procedures
The first part will measure the electromotive force by moving a permanent magnet into and out
of the coil, followed by moving a second coil with a current near the first coil and then changing
the current in the second coil. In the final part of this experiment, a homemade coil will be made
using a wire. Overall, from Faraday’s law and what we have learned about inductive forces, one
should expect to see an induced electromotive force that is proportional to the rate of change of
the magnetic field.
Questions
Section 2
Faraday’s law says that for a single circuit around the boundary of the area the EMF= −dΦ/dt.
Why is there a negative sign in Faraday’s law? Section 3
By looking at the voltage polarities of the peaks, how can you determine the magnetic pole that
is being inserted into the coil? Section 4
Try reversing the current to the coil by switching the leads. (In theory, the coil could be turned
over, but the connectors to the coil then make it difficult to move the 2 coils together). What are
the differences and why? Section 5
M does not depend on the current. Is it possible to orient the two coils so that M is zero? Why or
why not? Section 6
Observe the voltage polarities on the graph and determine which magnetic pole you’re trusting
into the coil.
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