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An ac source is rated at 220V, 50 Hz. The time taken for voltage to change from its peak value to zero

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

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A lamp consumes only 50% of peak power in an ac circuit. What is the phase difference between the applied voltage and the circuit

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The instantancous voltage through a device of impedance `20Omega` is `ε= 80 sin100π t ` . The effective value of the current

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

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A choke coil

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

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A resistor and a capicitor are connected in series with an ac source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, the applied voltage

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

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In an ac circuit the emf (e) and the current (i) at any instant core given respectively by `e = E_O sinomegat`, `I= I_o sin (ωt- φ)` The average power in the circuit over one cycle of ac

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

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The instanteneous value of current in an A.C. circuit is `I= 2sin (100pi t+pi/3)A`. The current will be maximum for the first time

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

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An alternating current of frequency 'f' is flowing in a circuit containing a resistance R and a choke L in series.The impedance of this circuit

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

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The resistance of an R-L circuit is `10_Omega`. An emf `E_O` applied across the circuit at `omega = 20 rad`/s. If the current in the ckt is `I_o/sqrt2` what is the value of

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

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A resistor `30_Omega` , inductor of reactance `10_Omega` and the capacitor of reactance `10_Omega` are connected in series to an ac voltage source `e = 300sqrt 2 sin(ωt)` The current in the circuit

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

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Same current is flowing in two alternating circuits.The first circuits contains only inductance and the other contains only a capacitor. If the frequency of the emf of ac is increased the effect on the value of the current will

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

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The value of alternating emf E in the given ckt will

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A 20 volts ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil

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

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An alternating voltage `E=200sqrt 2 sin (100t)` is connected to 1 microfarad capacitor through an ac ammeter. The reading of the ammeter shall

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

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In a region of uniform magnetic induction `B = 10^(-2)` tesla, a circular coil of radius 30 cm and resistance ` π^2` ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil

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

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An LCR series circuit with `R = 100Omega` is connected to a 200 V, 50 Hz a.c source when only the capacitance is removed the current lies the voltage by `60^0` when only the inductance is removed, the current leads the voltage by `60^0` . The current in the circuit

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

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The impedance of a circuit consists of `3Omega`resistance and `4Omega` reactance. The power factor of the circuit

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

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The power factor of a good choke coil

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

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A coil of inductance L has an inductive reactance of `X_L` in an AC circuit in which the effective current is I. The coil is made from a super-conducting material and has no resistance. The rate at which power is dissipated in the coil

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

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When 100 volt dc is applied across a coil, a current of 1A flows through it. When 100 volt ac at 50 cyle `s^(-1)` is applied to the same coil, only 0.5 A current flows. The impedance of the coil

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

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