When an \( A C \), voltage, of variable frequency is applied to series \( L-C-R \) circuit, the ... VIDEO
When an \( A C \), voltage, of variable frequency is applied to series \( L-C-R \) circuit, the current in the circuit to the same at \( 4 \mathrm{kHz} \) and \( 9 \mathrm{kHz} \). The current in the circuit is maximum at
(1) \( 5 \mathrm{kHz} \)
(2) \( 6.5 \mathrm{kHz} \)
(3) \( 4 \cdot 2 \mathrm{kHz} \)
(4) \( 6 \mathrm{kHz} \)
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\[
V=V_{0} \sin \omega t
\]
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