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 [MNR 1998; JIPMER 2001, 02]

In an ac circuit, the instantaneous values of e.m.f. and current are e = 200 sin 314 t volt and\[i=\sin \,\left( 314t+\frac{\pi }{3} \right)\] ampere. The average power consumed in watt is [NCERT 1990; RPMT 1997]

Which of the following plots may represent the reactance of a series LC combination [MP PMT 1999]

In given circuit capacitor initially uncharged. Now at t=0 switch S is closed then current given by source at any time t is

What is the value of inductance L for which the current is maximum in a series LCR circuit with \[C=10\mu F\] and \[\omega =1000{{s}^{-1}}\]?

A small signal voltage\[V(t)={{V}_{0}}\,\sin \,\omega t\]is applied across an ideal capacitor C:

A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is

A capacitor of\[10\,\mu F\]and an inductor of 1 H are joined in series. An ac of 50 Hz is applied to this combination. What is the impedance of the combination?

A coil has an inductance of 0.7 henry and is joined in series with a resistance of \[220\,\Omega \]. When the alternating emf of 220 V at 50 Hz is applied to it then the phase through which current lags behind the applied emf and the watt less component of current in the circuit will be respectively

Time constant of L-R circuit will be

In a LCR circuit capacitance is changed from C to 1C. For the resonant frequency to remain unchanged, the inductance should be change from L to

In the LC circuit, the current is in the direction shown and the charges on the capacitor plates have the signs shown. At this time,

The circuit shown has been operating for a long time. The instant after the switch in the circuit labeled S is opened, what is the voltage across the inductor \[{{V}_{L}}\] and which labeled point (A or B) of the inductor is at a higher potential? Take \[{{R}_{1}}=4.0\,\Omega \], \[{{R}_{2}}=8.0\,\Omega \] and \[L=2.5\,H\].

An inductor (L=0.03 H) and a resistor\[(R=0.15k\Omega )\]are connected in series to a battery of 15V emf in a circuit shown below. The key \[{{K}_{1}}\] has been kept closed for a long time. Then at t= 0, \[{{K}_{1}}\] is opened and key \[{{K}_{2}}\], is closed simultaneously. At f = 1 ms, the current in the circuit will be : \[({{e}^{5}}\cong 150)\]

In an LCR circuit as shown below both switches are open initially. Now switch\[{{S}_{1}}\]is closed, \[{{S}_{2}}\] kept open. (q is charge on the capacitor and\[\tau =RC\]is Capacitive time constant). Which of the following statements is correct?