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Samuel Dzifanu
Lab 212: Magnetic
Field of Helmholtz Coils
Lab 212
Magnetic Field of Helmholtz Coils
BiotSavart Law
Name:
Samuel Dzifanu
Objective:
To study the effects of two opposing magnetic fields that are produced by
electromagnetic Helmoltz coils, and how it changes as the distance between the coils and the
distance from the sensor.
Theory:
Helmholtz coils are a pair of coils that each has the same radius, R. The coils are placed
parallel to each other a distance R apart and along the same axis. The magnetic field along the
axis at the midpoint between the two coils is then given by
=
=
+
B
µoIRsinθ2r2
µoNIR22R2 x232
where µo = 4π x 10^7 (tesla•meters)/amp, I is the current (amps) in one coil, R is the radius of
the coil, and N is the number of turns of wire in one coil.
Procedure:
The experiment consists of us moving the two coils and then taking the reading that the
Vernier magnetic field sensor sends to the computer. The coils are set up with the magnetic
fields pointing in the same direction as each other and a constant current, radius and number of
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 Spring '11
 Opyrchal
 Physics

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