English

In the LCR series circuit, what are the (a) impedance and (b) reactance at current resonance? - Physics

Advertisements
Advertisements

Question

In the LCR series circuit, what are the (a) impedance and (b) reactance at current resonance? 

Short Note

Solution

At resonance,

  1. the impedance is minimum, i.e, Z = R
  2. net reactance is zero as |XL - XC| = 0.  
shaalaa.com
Electric Resonance
  Is there an error in this question or solution?
Chapter 13: AC Circuits - Short Answer I

APPEARS IN

SCERT Maharashtra Physics [English] 12 Standard HSC
Chapter 13 AC Circuits
Short Answer I | Q 4

RELATED QUESTIONS

A parallel LC resonant circuit is used as ______ 


State any two characteristics of a series LCR AC resonance circuit.


A parallel plate air condenser of capacity 10 µF is charged to a potential of 1000 V. The energy of the condenser is ______


Out of the following graphs, which graph shows the correct relation (graphical representation) for LC parallel resonant circuit?


In series resonance, LCR circuit, below the resonant frequency, the circuit is ____________.


An A.C. voltage of r.m.s. value 0.1 V is applied to an LCR series circuit in which L = 100 µH and C = 9 x 10-8 F and R = 2 `Omega`. The resonant frequency will be ____________.


In the given electrical circuit, which one of the following equations is a correct equation?


In parallel resonance, the current will be minimum, when ____________.


In LCR circuit, the capacitance is changed from C to 4C. For some resonant frequency, the inductance should be changed from L to ____________.


At what frequency (approximate) will the inductive reactance of 4 H inductance be equal to the capacitive reactance of 4 µF capacitance?


A parallel combination of pure inductor and capacitor is connected across a source of alternating e.m.f. 'e'. The currents flowing through an inductor and capacitor are iL and iC respectively. In this parallel resonant circuit, the condition for currents i, iL and iC is (i = net r.m.s. current in the circuit)


Out of the following graphs which graph shows the correct relation for LC parallel resonant circuit?






In rejector circuit, above resonant frequency the circuit is ____________.


In series resonant circuit, at resonance, ____________.


A coil of 16 mH and a capacitor of 10 µF are in series with an A.C source along with 5 `Omega` resistances. If inductive reactance is equal to capacitive reactance, then the angular frequency (in rad/s) of source is ____________.


The resonant frequency of a series LCR circuit is 'f'. The circuit is now connected to the sinusoidally alternating e.m.f of frequency '2f'. The new reactance X'L and X'C are related as ____________.


An a.c. source of variable frequency 'f' is connected to an LCR series circuit. Which one of the graphs represent the variation of current 'I' in the circuit with frequency 'f'?


In LC parallel resonance circuit, choose the correct statement.


An electric lamp connected in series with a capacitor and an AC source glows with a certain brightness. (a) How does the average power change on increasing the capacitance? (b) How does the brightness of the lamp change on increasing the capacitance?


State the use of the acceptor circuit.


A coil of resistance 5 Ω and self inductance 0.2 H is connected in series with variable capacitor across a 30 V(rms), 50 Hz supply. (i) At what capacitance resonance occur? (ii) Find the corresponding current.


What are the Uses of rejector circuit?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×