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  4. A series L C R circuit is connected to an ac source of variable frequency. When the frequency is increased continuously, starting from a small value, the power factor

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Q. A series $L C R$ circuit is connected to an ac source of variable frequency. When the frequency is increased continuously, starting from a small value, the power factor

Alternating Current

Solution:

$\cos \phi=\frac{R}{2}$
when $2=R$, i.e at resonance
$\cos \phi $=is max ( when $Z$) is max
$\therefore $ max at a particular frequency