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Unformatted text preview: Matt Weiner Phys. 241 11/7/06 Lab 10 Induced EMF Goal: To study properties of magnetic fields and coils that produces these fields. Theory: When we look at two coils that are coupled by magnetic field lines we have the equations: dt dB dt di L i - = 1 (1) dt di M 1 21 2- = From these equations we get the relationship: 1 21 1 2 max max L M = (2) L is the inductance of the first coil and M is the mutual inductance between coils. To calculate the V in the gauss of the magnetic field causing noise by using the relation: dt dB NA dt d- - = (3) Where N is the number of turns in the coil and A is the area of the turns. (Assume t B B sin = ) The Inductive reactance depends on both the frequency, , of the current and the inductance of the inductor, L : L X L = (5) The current in the inductor is the same as the current through the resistor. Procedure: IV. Lab electromagnetic noise When looking at the signals in inducting coils there usually is some noise in the...
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- Spring '08