Alternating Current

A light bulb and an inductor coil are connected to an ac source through a key as shown in the figure below. The key is closed and after sometime an iron rod is inserted into the interior of the inductor. The glow of the…

The net impedance of circuit (as shown in figure) will be:

Figure shows a circuit contains three identical resistors with resistance $R=9.0\Omega\,$ each, two identical inductors with inductance $L=2.0\mathrm{mH}$ each, and an ideal battery with emf $\epsilon\,=18V$. The…

For very high frequencies, the effective impedance of the circuit (shown in the figure) will be

A $100\Omega\,$ resistance and a capacitor of $100\Omega\,$ reactance are connected in series across a $220 V$ source. When the capacitor is $50%$ charged, the peak value of the displacement current is

In a circuit consisting of a capacitance and a generator with alternating emf,$E_{g}=E_{go}sin\omega\,t,V_{C}$and $I_{C}$are the voltage and current. Correct phasor diagram for such circuit is

An inductor of $10$ mH, capacitor of $0.1\ \mu$F and a resistor of $100\ \Omega$ are connected in series across an $a.c$ power supply $220$ V, $70$ Hz. The power factor of the given circuit is $0.5$. The difference in…

An ACcircuit has an inductor and a resistor of resistance $R$ in series, such that $X_{L}=3R$. Now, a capacitor is added in series such that $X_{C}=2R$. the ratio of the new power factor with the old power factor of the…

An inductor of $10\mathrm{mH}$is connected to a $20V$battery through a resistor of $10\mathrm{k\Omega}$ and a switch. After a long time, when maximum current is set up in the circuit, the current is switched off. The…

A series LCR circuit consists of $R=80\Omega\,$. $X_{L}=100\Omega\,$, and $X_{C}=40\Omega\,$. The input voltage is $2500\cos\,\left(100\pi\,t\right)V$. The amplitude of current, in the circuit, is _____$A$?

Match List I with List II. List I List II (a) Rectifier (i) Used either for stepping up or stepping down the A.C. voltage (b) Stabilizer (ii) Used to convert A.C. voltage into D.C. voltage (c) Transformer (iii) Used to…

In an $LCR$series circuit, an inductor $30\mathrm{mH}$ and a resistor $1\Omega\,$ are connected to an $\mathrm{AC}$ source of angular frequency $300\rad\,s^{-1}.$ The value of capacitance for which the current leads the…