In a circuit `L, C` and `R` are connected in series with an alternating voltage source of frequency `f`. The current lead the voltages by `45^(@)`. The value of `C` is :

In a circuit L,C and R are connected in series with an altematng voltage source of frequency f. The current leads the voltage by 60degree. The value of (X_c -X_L) is

A series L-C-R circuit is connected to an alternating voltage source of frequecy f. If the current leads the e.m.f. By 45^(@) , then the value of C is

An alternating voltage is applied to a series L-C-R circiut. If the current leads the voltage by 45^(@) , then

A bulb and a capacitor are connected in series to a source of alternating current. If its frequency is increased, while keeping the voltage of the source constant, then

Resistor of resistance R and capacitor of capacitance C are connected in series to an AC source of angular frequency omega . Rms current in the circuit is I. When frequency of the source is changed to one - third of initial value keeping the voltage same then current is found to be halved. Find the ratio of reactance of capacitor to that with resistance at the original frequency omega .

In an A.C. circuit, a resistance R=40 Omega and an inductance L are connected in series. If the phase angle between voltage and current is 45^(@) , then the value of the inductive reactance will be

In a series LCR circuit, the frequency of the source is more than resonance frequency. The current in the circuit leads the voltage in phases(True/false).

You are given three circuits X, Y and Z when the element X is connected across an a.c. source of a given voltage, the current and voltage are in same phase. When element Y is connected in series with X across the source, voltage is ahead of voltage by pi//4 . But the current is ahead of voltage by pi//4 , when Z is connected series with X, across the source. Identify the circuit elements X, Y and Z. When all the three elements are connected in series across the same source, determine the impedance of the circuit . Draw a plot of current versus the frequency of applied source and mention the significance of this plot.