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CBSE - XII Science - Physics - Alternating Current
An inductor, a capacitor and a resistor are connected in series across an ac source of voltage. If the frequency of the source is decreased gradually. the reactance of: (a) both the inductor and the capacitor decreases. (b) inductor decreases and the capacitor increases. (c) both the inductor and the capacitor increases. (d) inductor increases and the capacitor decreases.
Asked by paresh0311
6th March 2023,
4:42 PM
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
What is the principle of a transformer??
Asked by pksunilnair
26th August 2017,
7:12 PM
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
(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
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
How can Q factor be improved?
Asked by Topperlearning User
22nd June 2015,
10:50 AM
CBSE - XII Science - Physics - Alternating Current
Can we have resonance in RL or RC circuit?
Asked by Topperlearning User
22nd June 2015,
10:43 AM
CBSE - XII Science - Physics - Alternating Current
Which circuit is used as filter circuit or rejector circuit and why?
Asked by Topperlearning User
22nd June 2015,
10:43 AM
CBSE - XII Science - Physics - Alternating Current
What is a parallel resonance circuit? Why is it called so?
Asked by Topperlearning User
22nd June 2015,
10:42 AM
CBSE - XII Science - Physics - Alternating Current
What happens to the circuit with very high Q value?
Asked by Topperlearning User
22nd June 2015,
10:37 AM
CBSE - XII Science - Physics - Alternating Current
What is Q factor?
Asked by Topperlearning User
22nd June 2015,
10:37 AM
CBSE - XII Science - Physics - Alternating Current
What is Acceptor Circuit?
Asked by Topperlearning User
22nd June 2015,
10:37 AM
CBSE - XII Science - Physics - Alternating Current
What is resonance frequency?
Asked by Topperlearning User
22nd June 2015,
10:36 AM
CBSE - XII Science - Physics - Alternating Current
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
CBSE - XII Science - Physics - Alternating Current
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
