Recent questions tagged #mcq

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An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω power dissipated in the circuit

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a LCR circuit capacitance is changed from C to 2C. For the resonant fequency to remain unchanged, the inductance should be change from L

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In an LCR series ac circuit the voltage across each of the components L, C and R is 50 V. The voltage across the LC combination will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An inductor L and capacitor C are connected in the circuit as shown in fig. The frequency of the power supply is equal to the resonant frequency of the circuit. Which ammeter will read zero

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by `45^0` . The value of c

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a series resonant LCR circuit, the voltage across R is 100 V and `R= 1kOmega` with `C =2muF`. The resonant frequency `omega` is 200 rad/s.At resonance the voltage across L

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A coil of inductive reactance `31Omega` has a resistance of `8Omega` . It is placed in series with a condenser of copacitive reactance `25Omega` . The combination is connected to an a.c. source of 110 volt. The power factor of the circuit

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The diagram shows a capacitor C and resistor R connected in series to an ac source. V1 and V2 are voltmeters and Ais an ammeter, consider the following statements. (1) Readings in A and V2 are always in phase. (2) Reading in V1 is ahead in phase with reading in V2 . (3) Reading in A and V1 are always in phase. Which of these statements are / is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The reading of ammeter in the circuit shown will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In the adjoining circuit the voltmeter whose reading will be zero at resonance

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In the adjoining figure the impedance of the circuit will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Is it

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For the given

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A periodic voltage V varies with time t as shown in the figure. T is the time period. The r.m.s. value of the voltage is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The potential difference V and current I flowing through the AC circuit is given by `V=5 cos(omegat –pi/6)` volt `and I = 10sinomegat` ampere. The average power dissipated in the circuit

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The radius of a coil decreases steadily at the rate of `10^(–2)` m/s. A constant and uniform magnetic field of induction `10^(–3) Wb'/'m^2` acts perpendicular to the plane of the coil. The radius of the coil when the induced e.m.f. in the coil is `1muV`, is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A time varying voltage `V=2t` volt is applied across an ideal inductor of inductance `L=2H` as shown in figure. Then select incorrect

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A circular coil of 500 turns encloses an area of `0.04 m^2`. A uniform magnetic field of induction `0.25 Wb'/'m^2` is applied perpendicular to the plane of the coil. The coil is rotated by 90° in 0.1 second at a constant angular velocity about one of its diameters. A galvanometer of resistance `25Omega` was connected in series with the the coil. The total charge that will pass through the galvanometer is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A condenser of capacity `6 µF` is fully charged using a 6-volt battery. The battery is removed and a resistanceless 0.2 mH inductor is connected across the condenser. The current which is flowing through the inductor when one-third of the total energy is in the magnetic field of the inductor is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For the circuit shown, which of the following statement(s) is(are)

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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