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When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220V. This

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

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To reduce the reasonant frequency in an LCR series circuit with a

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

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Which of the following combinations should be selected for better tuning of an LCR circuit used for

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

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An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (rms) a.c. source. The power dissipated in the circuit

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

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The output of a step-down transformer is measured to be 24 V when connected to a 12 watt light bulb. The value of the peak current

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

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As the frequency of an ac circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the

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

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In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit

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

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Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are)

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

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For an LCR circuit, the power transferred from the driving source to the driven oscillator is `P=I^2

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

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When an AC voltage of 220 V is applied to the capacitor

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

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The line that draws power supply to your house from street

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

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A coil having area `2m^2` is placed in a magnetic field which changes from 1 wb /`m^2` to 4 wb/`m^2` in an interval of 2 second. The emf induced in the coil of single turn

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

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Two different loops are concentric & lie in the same plane. The current in outer loop is clockwise & increasing with time. The induced current in the inner loop then,

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

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A ring of radius r is rotating about its diameter with angular velocity `omega` in a perpendicular magnetic field `vecB` It has 20turns.The emf induced

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

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A magnetic field `2xx 10^(-2) T` acts at right angles to a coil of area `200 cm^2` with 25 turns. The average emf induced in the coil is 0.1 v when it removes from the field in time t. The value of t

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

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The magnetic flux linked with a coil, in webers, is given by the equation `phi=4t^2- 3t+ 7` . Then the magnitude of induced emf at 2 sec will be

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

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A solenoid of 1.5 m long with inner diamter of 4 cm has three layers of windings of 1000 turns each & carries a current of 2 A. The magnetic flux through a cross section of the solenoid is

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

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A coil has an area of 0.05 m2 & it has 800 turns. It is placed perpendicularly in a magnetic field of strength , `4xx10^(–5) Wb/m^(-2)`. It is rotated through `90^o` in 0.1 sec. The average emf induced in the coil

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A bar magnet is moving along the common axis of two coils A &B towards A. current is induced

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A coil having n turns & resistance `ROmega` is connected with a galvanometer of resistance `4ROmega`. This combination is moved from a magnetic field W1 Wb to W2 Wb in t second. The induced current in the circut

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

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