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Jody Lewin
Lab Partner: Juliana Petritis
Lab TA: Laxman Mainali
Lab 3: Magnetic CurrentCurrent Force
29 February 2008
Magnetic Current
Relevant Formulas:
1.
B = μ
0
I²
2.
F = ILB
3.
F = μ
0
LI²
4.
F = mg
2πr
2πr
5.
r = d + (h(upp) – h(down)) x
l(pivot wire)
.
2L(mirror – meter stick)
μ
0
= 4π x 10
7
Teslameter / amp
1.
B is the magnetic field produced by the current carried on a long wire.
2.
When a second wire is parallel to the first, a force (F) is produced.
L is the shorter wire.
3.
Combining formulas one and two we derive this formula replacing the B in formula two
for formula one.
Proceedure:
Adjust the wires so they are 0.5cm to 1.0cm apart.
With the laser on, adjust the system so
the laser hits the mirror and reflects back onto the meter stick.
Measure the distance between
wires (r).
After determining the voltage system is working, add a staple to the wire and increase
the voltage until the laser returns to the same place on the meter stick.
Record the current.
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 Spring '08
 Lanford

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