Alternating Current

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

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…

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…

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 the given figure, the charge stored in $6\mu\,F$ capacitor, when points $A$ and $B$ are joined by a connecting wire is _______$\mu\,C$.

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…

Magnetic materials used for making permanent magnets $(P)$ and magnets in a transformer $(T)$ have different properties of the following, which property best matches for the type of magnet required?

$$ \text { Find the time constant for the given } R C \text { circuits in correct order. } $$ $R_1=1 \Omega, R_2=2 \Omega, C_1=4 \mu \mathrm{F}, C_2=2 \mu \mathrm{F}$

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

An inductor 20 mH, capacitor 100 $\mu$F and a resistor 50 Ω are connected in series across a source of emf, V= 10sin⁡(314t⁡). The power loss in the circuit is

A seriesLCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is $\pi$3. If instead C is removed from the circuit, the phase difference is…