Advertisements
Advertisements
Question
Define 'quality factor' of resonance in a series LCR circuit. What is its SI unit?
Advertisements
Solution
The ratio `(omega_0L)/R`is called the quality factor or Q-factor.
`Q= (omega_0L)/R`
It is a dimensionless quantity.
RELATED QUESTIONS
An LR circuit contains an inductor of 500 mH, a resistor of 25.0 Ω and an emf of 5.00 V in series. Find the potential difference across the resistor at t = (a) 20.0 ms, (b) 100 ms and (c) 1.00 s.
Two coils A and B have inductances 1.0 H and 2.0 H respectively. The resistance of each coil is 10 Ω. Each coil is connected to an ideal battery of emf 2.0 V at t = 0. Let iA and iBbe the currents in the two circuit at time t. Find the ratio iA / iB at (a) t = 100 ms, (b) t = 200 ms and (c) t = 1 s.
Choose the correct answer from given options
The phase difference between the current and the voltage in series LCR circuit at resonance is
If an LCR series circuit is connected to an ac source, then at resonance the voltage across ______.
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 ______.
Which of the following components of an LCR circuit, with a.c. supply, dissipates energy?
Draw a labelled graph showing variation of impedance (Z) of a series LCR circuit Vs frequency (f) of the ac supply. Mark the resonant frequency as f0·
A 20Ω resistance, 10 mH inductance coil and 15µF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is made \[\frac {1}{3}\] rd, the resonant frequency ______.
In the given circuit, rms value of current (Irms) through the resistor R is:
