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Amplitude of a wave is represented by A=...

Amplitude of a wave is represented by `A=(c)/(a+b-c)`. Under what conditions, the resonance will occur.

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The resonance will occur when amplitude A becmes infinite. It will be so if `a+b-c=0`. Which will be possible if
`(i) a=c-b (ii) b=0` and `a=c.`
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