Questions in Alternating Current

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A $12$ ohm resistor and a $0.21$ henry inductor are connected in series to an ac source operating at $20$ volts, $50$ cycle/second. The phase angle between the current and the source voltage is
What will be the phase difference between virtual voltage and virtual current, when the current in the circuit is wattless
The resonant frequency of a circuit is $f$. If the capacitance is made $4$ times the initial values, then the resonant frequency will become
In the non-resonant circuit, what will be the nature of the circuit for frequencies higher than the resonant frequency
In an ac circuit, the potential difference across an inductance and resistance joined in series are respectively $16$ V and $20$ V. The total potential difference across the circuit is
A $220$ V, $50$ Hz ac source is connected to an inductance of $0.2$ H and a resistance of $20$ ohm in series. What is the current in the circuit
An LCR circuit contains $R = 50 \Omega$ , $L = 1 mH$ and $C = 0.1 \mu F$. The impedance of the circuit will be minimum for a frequency of
In a series LCR circuit, resistance $R = 10\Omega $ and the impedance $Z = 20\Omega .$ The phase difference between the current and the voltage is
A series ac circuit consist of an inductor and a capacitor. The inductance and capacitance is respectively $1 henry$ and $25\mu F.$ If the current is maximum in circuit then angular frequency will be
An alternating e.m.f. of frequency $v\,\left( { = \frac{1}{{2\pi \sqrt {LC} }}} \right)$ is applied to a series LCR circuit. For this frequency of the applied e.m.f.

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