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Under what conditions, power factor of a...

Under what conditions, power factor of an a.c. circuit is maximum ?

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Power factor `= (R )/(Z) = (R )/(sqrt(R^(2) + (X_(L) - X_(C))^(2)))`
Max. value of power factor is 1, when `Z = R`
i.e.,when `X_(L) = X_(C )`, i.e., at resonance, when the circuit is non-inductive.
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