Resonance

Resonance occurs in an electric circuit at a particular resonance frequency when the impedance between the input and output of the circuit is at a minimum.

f=\frac{1}{2\pi \sqrt{LC}} L=\frac{1}{\left( 2\pi f \right)^2C} C=\frac{1}{\left( 2\pi f \right)^2L}

More info: http://en.wikipedia.org/wiki/Electrical_resonance

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