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• CBSE×
• Class 12 Science×
• Physics×
• Alternating Current×
• Resonance In Lcr Circuit×

# Resonance In Lcr Circuit Free Doubts and Solutions

## A sinusoidal voltage of peak value 10 V is applied to a series LCR circuit in which resistance capacitance and inductance have value of 10ohm, 1µF and 1H respectively .find (i)the frequency which drives the circuit at resonance (ii)quality factor of the circuit.

Asked by rohitraman1115 12th January 2019, 10:40 AM

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## what is sharpness of resonance and graph between current and frequency for two different series lcr circuits

Asked by HARPRIYA 5th September 2017, 8:44 PM

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## What is the principle of a transformer??

Asked by pksunilnair 26th August 2017, 7:12 PM

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## Value of power factor of L.C.R circuit which is in the state of resonance?

Asked by Anshul 14th August 2017, 9:18 PM

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## Instantaneous EMF of A.C source is given by E=300 sin314t.What is the value of Erms?

Asked by Anshul 14th August 2017, 9:16 PM

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## If the effective value of current in 50Hz A.c circuit is 5 Ampere.What is the peak value of current value of current 1/300 second  after it was zero?

Asked by Anshul 14th August 2017, 9:14 PM

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## Could you plaese tell me all the derivations of Physics chapterwise as per CBSE BOARD along with their priority?

Asked by Jyoti Chandra Azad 5th December 2015, 7:18 PM

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## An inductor 200 mH, a capacitor of 500 μF and a resistor of 10 Ω are connected in series to a 100 V, variable frequency a.c. source. Calculate the (i) frequency at which the power factor of the circuit is unity (ii) current amplitude at this frequency (iii) Q-factor.

Asked by Topperlearning User 22nd June 2015, 12:49 PM

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## The generation of emf when the magnetic flux associated with a coil changes is known as electromagnetic induction. (a) Mention the factors on which the self inductance of a solenoid depends. (b) Calculate the energy stored in an inductor of inductance 50 mH when a current of 2 A is passing through it. (c) Two identical loops one of copper and other of aluminium are rotated with same speed in the same magnetic field. In which case the (i) Induced emf (ii) Induced current will be more and Why? Or (a) An alternating voltage is applied across an LCR circuit as shown below. Draw the phasor diagram for the circuit. (b) Prove that an inductor offers easy path to d.c. and a resistive path to a.c. (c) In the above circuit if L = 100 mH, C = 100 μF, R = 120 Ωand E = 30 sin (100 t) find the (i) Impedance (ii) Reactance (iii) Peak current and (iv) Resonant frequency of the circuit.

Asked by Topperlearning User 22nd June 2015, 12:43 PM

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## (i) With the help of a labeled diagram, descried briefly the underlying principle and working of a step up transformer. (ii) Write any two sources of energy loss in a transformer. (iii) A step up transformer converts a low input voltage into a high output voltage. Does it violate law of conservation of energy? Explain. OR Derive an expression for the impedance of a series LCR circuit connected to an AC supply of variable frequency.   Plot a graph showing variation of current with the frequency of the applied voltage.   Explain briefly how the phenomenon of resonance in the circuit can be used in the tuning mechanism of a radio or a TV set.

Asked by Topperlearning User 22nd June 2015, 12:30 PM

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## Describe briefly, with the help of a labeled diagram, the basic elements of an A.C. generator. State its underlying principle. Show diagrammatically how an alternating emf is generated by a loop of wire rotating in a magnetic field. Write the expression for the instantaneous value of the emf induced in the rotating loop. 5 OR A series LCR circuit is connected to an ac source having voltage v=vm sin ωt . Derive the expression for the instantaneous current I and its phase relationship to the applied voltage. Obtain the condition for resonance to occur. Define 'power factor'. State the conditions under which it is (i) maximum and (ii) minimum.

Asked by Topperlearning User 22nd June 2015, 12:28 PM

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## Find the Q factor given LCR for a circuit as 2 H, 10 F, 10 Ω.

Asked by Topperlearning User 22nd June 2015, 10:56 AM

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## How can Q factor be improved?

Asked by Topperlearning User 22nd June 2015, 10:50 AM

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## Can we have resonance in RL or RC circuit?

Asked by Topperlearning User 22nd June 2015, 10:43 AM

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## Which circuit is used as filter circuit or rejector circuit and why?

Asked by Topperlearning User 22nd June 2015, 10:43 AM

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## What is a parallel resonance circuit? Why is it called so?

Asked by Topperlearning User 22nd June 2015, 10:42 AM

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## What happens to the circuit with very high Q value?

Asked by Topperlearning User 22nd June 2015, 10:37 AM

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## What is Q factor?

Asked by Topperlearning User 22nd June 2015, 10:37 AM

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## What is Acceptor Circuit?

Asked by Topperlearning User 22nd June 2015, 10:37 AM

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## What is resonance frequency?

Asked by Topperlearning User 22nd June 2015, 10:36 AM

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## The figure shows a series LCR circuit with L= 5.0 H, C = 80 μF, R = 40Ω connected to variable frequency 240 V source. Calculate (i) The angular frequency of the source which driver the circuit at resonance. (ii) The current at the resonating frequency. (iii) The rms potential drop across the capacitor at resonance.

Asked by Topperlearning User 22nd June 2015, 8:38 AM

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## 1.does the current in an AC circuit lags,leads remains in phase with the voltage of frequency (f) applied to the circuit, when  (i)f=fr   (ii)f<fr   (iii) f>fr,where fr is the resonant frequency?   2.what happens to the focal length of lens when it is immersed in water?

Asked by Karishma 7th March 2015, 10:33 PM