Old Dominion University PHYS 112N Physics 112N LAB 7. - Physics 112N LAB Lab Report 7 Magnetic Induction INTRODUCTION A magnetified is a vector field which surrounds magnets and

INTRODUCTION
A magnetified is a vector field which surrounds magnets and electric currents, and is
detected by the force it exerts on moving electric charges and on magnetic materials. When
placed in a magnetic field, magnetic dipoles tend to align their axes parallel to the magnetic field.
Magnetic fields also have their own energy with an energy density proportional to the square of
the field intensity. The purpose of this experiment is to see how a changing magnetic field can
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induce a current in a circuit. We also want to test how both step-up and step-down transformers
work and how iron can affect the induced emf. Ideally, a transformer would achieve a 100%
efficiency rate when stepping up or stepping down voltage. In reality, however, some amount of
energy is dissipated in the form of heat, and then the system efficiency must be calculated as a
percentage of the actual output vs. the theoretical.
In this experiment it involved setting up both step-down and step-up transformers. For the
step-down transformer, we connected the large (primary) coil to the function generator with red
and black banana cables. We also connected the myDAQ interface to the primary coil via a
BNC-Banana cable. Next, we connected the myDAQ interface to the secondary coil using a
second BNC-Banana cable and opened the computer program NI ELVIS Instrument Launcher
and opened the Scope program. We first collected data from just the isolated large coil by
running the scope program and adjusting the settings on the function generator and channel
settings to view the signal properly. We then slowly inserted the small coil into the larger coil and
observed the generated signal. Using the cursors C1 and C2, we recorded the maximum voltages
for the primary and secondary coils. We inserted the iron core into the smaller core and observed
the changes in the signals and recorded the new maximum voltages. We assembled the step-up
transformer by swapping the cables connected to the primary and secondary coils and removing
the iron core. We then repeated the previous described steps for data collection and recorded our
data. This concluded our procedure for the experiment.