V
pp
=
_______ volts/div
x
_______ div =
_______ volts
d.
What is the setting on the Sec/Div control knob?
__________
seconds/div
e.
How many horizontal divisions from positive going crossing to positive
going crossing?
_______ div
f.
What is the period of the signal (T)?
T =
_______ seconds/div
x
_______ div =
__________ seconds
g.
What is the frequency of the signal (f)? __________ hertz
Examiner:_____________________________
Date:______________________
II.
Display a signal of the tuning fork that is produced by the microphone on Channel 2
and calculate its frequency.
a. Period of the signal (T)
T =
___________ seconds/div
x
__________ div =
___________
seconds
b. Frequency of the signal (f)______________ hertz
Examiner:_____________________________
Date:______________________
Please turn in this page only when finished.
PHYSICS 210L
PHYSICS 210L
Electromagnetic Induction
Introduction and Theory
In your own words, discuss the purpose of this experiment. Don’t forget to discuss the
meaning of the relevant concepts (Magnetic flux, Faradays Law, and Lenz’s Law).
Materials
Twp 3400-turn big coil
Galvanometer
A 1.5V battery
Cables with banana-to-banana plugs
BNC cables
PASCO 200-turn large loop coil, 400-turn and 2000-turn small loop coil
Function Generator
Oscilloscope
A small compass
Procedure
Part 1
1.
Connect a 3400-turn big coil (62.5
) to a 1.5 V battery (leave one of the terminals
unconnected for now). Place a small compass inside the coil (on axis if possible) with
its needle pointing perpendicular to the coil axis.
Now temporarily complete the circuit by touching the unconnected terminal to the
battery. What happens to the compass? Why? See if you can deduce the direction of the
polarity of the compass needle.
2.
Connect one big coil to a Galvanometer and the other big coil to 1.5v battery (leave
one of the terminals unconnected for now). Make sure the faces of the coils are
parallel to each other (within 1 cm).
Experiment
12
PHYSICS 210L
Now temporarily complete the circuit by touching the unconnected terminal to the
battery. What happens to the galvanometer? Does it deflect? Which way and why? Give
an example where this effect will occur.
Part 2
A small coil of 400-turns will be connected to a signal generator (called the field coil). An
oscilloscope will monitor the voltage applied to the coil. Since the current through the coil
varies with time, the field produced by the coil will vary with time. A 2000-turn coil called
the detector coil
will be also connected to an oscilloscope. The detector coil signal will
be monitored simultaneously with the voltage applied to the field coil.
Follow the
procedure below.
1.
Square wave input signal.
Connect the 400-turn small loop to the signal generator. Turn on the
generator and the oscilloscope. Set the signal generator to produce a 1V
square wave (peak-to-peak) at 100Hz with the aid of the oscilloscope.
Make sure that the signal is observed on channel 1 of the oscilloscope. If
the vertical setting is set to 0.5V/division, the overall height (peak-to-peak)
of the observed signal will be 2.0 cm.
