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Resonance, cont

Theoretically, if R = 0 the current would be infinite at resonance

Real circuits always have some resistance

Tuning a radio

A varying capacitor changes the resonance frequency of the tuning circuit in your radio to match the station to be received

Metal Detector

The portal is an inductor, and the frequency is set to a condition with no metal present

When metal is present, it changes the effective inductance, which changes the current which is detected and an alarm sounds

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