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X p l o r e r G L X U s e r s ’ G u i d e
127
A c t i v i ty 7 : I n d u c e d E l e c tr o m o t i v e F o r c e
Background
When a permanent magnet passes through a coil, the changing magnetic flux
induces and electromotive force (EMF) or voltage in the coil. According to Fara-
day’s Law of Induction:
where
ε
is the induced EMF, N is the number of turns in the coil, and
is
the rate of change of magnetic flux through the coil.
In this activity, you will drop a magnet through a coil while the GLX records and
graphs the induced EMF versus Time. The area under the under the curve repre-
sents the total change in flux.
Before You Begin
Start a new experiment on the GLX.
1.
Press
to go to the Home Screen.
2.
Use the arrow keys to highlight the Data Files icon and press
to open
the Data Files screen.
3.
Press
to open the Files menu and press
to select New File.
4.
When the GLX asks if you would like to save the previous file, press
to save or
not to save.
Procedure
Equipment Set-Up
1.
Clamp or mount the coil so that the magnet can be dropped through it.
2.
Place something soft under the coil to prevent the magnet from breaking.
3.
Connect the voltage probe to the coil so that it will measure the voltage
across the coil.
Equipment
Quantity
Xplorer GLX
1
Voltage Probe
1
Coil
1
Bar Magnet
1
1
Use a coil with a few hundred turns,
such as the one included with PASCO
part CI-6512.
ε
N
d
φ
dt
------
–
=
d
φ
dt
⁄
F4
1
pqrs
F1
F2
Summary of Contents for Xplorer GLX
Page 4: ......
Page 6: ......
Page 7: ...Part 1 Users Guide...
Page 8: ......
Page 18: ...12 O v e r v i e w o f t h e G L X...
Page 94: ...88 S e t t i n g s S c r e e n...
Page 98: ...92 P r i n t i n g...
Page 104: ...98 O p e r a t i n g T e m p e r a t u r e...
Page 112: ......
Page 116: ...110 C a l o r i m e t r y...
Page 132: ...126 V o l t a g e v e r s u s R e s i s t a n c e...
Page 136: ...130 I n d u c e d E l e c t r o m o t i v e F o r c e...
Page 146: ...140 B e a t F r e q u e n c y...
Page 150: ......
Page 152: ......