AIPMT Prelims Physics Alternating Current Class 12 Questions

In an electrical circuit R, L, C and an a.c voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is π/3. If instead, C is removed from the circuit, the phase difference is again π/3. The power factor of the circuit is

In an AC circuit an alternating voltage e = 200√2 sin 100t volts is connected to capacitor of capacity 1 μF. The r.m.s. value of the current in the circuit is

An AC voltage is applied to a resistor R and inductor L in series. If R and the inductive reactance are both equal to 3 Ω, the phase difference between the applied voltage and the current in the circuit is

In the given circuit the reading of voltmeter V₁ and V₂ are 300 volts each. The reading of the voltmeter V₃ and ammeter A are respectively

Power dissipated in an LCR series circuit connected to an a.c source of emf ε is:

In an A.C. circuit the emf (e) and the current (i) at any instant are given respectively by : e = E₀ sin ωt i = I₀ sin (ωt − ϕ) The average power in the circuit over one cycle of A.C. is -

What is the value of inductance L for which the current is maximum in a series LCR circuit with C = 10 µF and ω = 1000s– 1

A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitative reactance 25 Ω. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is:

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°. The value of C is :

For a series LCR circuit the power loss at resonance is :-

The value of quality factor is :