Physics – Physics Education
Scientific paper
2006-06-14
Physics
Physics Education
9 pages, 10 figures, Fig.1 is corrected, figures in png files, short version is published in Am. J. Phys. 76, (2008) 129
Scientific paper
10.1119/1.2820391
We present a simple method to determine the mutual inductance $M$ between two coils in a coupled AC circuit by using a digital dual-phase lock-in amplifier. The frequency dependence of the real and imaginary parts is measured as the coupling constant is changed. The mutual inductance $M$ decreases as the distance $d$ between the centers of coils is increased. We show that the coupling constant is proportional to $d^{-n}$ with an exponent $n$ ($\approx$ 3). This coupling is similar to that of two magnetic moments coupled through a dipole-dipole interaction.
Goodman Lindsey R.
Newman Seth A.
Schauber Michael J.
Suzuki Itsuko S.
Suzuki Masatsugu
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