PrepWiser › Learn › Physics › Alternating CurrentAlternating Current — JEE Main PYQs & Practice Questions Alternating Current is a Physics chapter in the JEE Main syllabus. This page brings together 144 previous-year and practice questions on Alternating Current, organised into 7 topics: AC Circuits: R, L, C, Phasors and Impedance, Power in AC Circuits, Transformers, AC Voltage and Current, Series RLC Circuit and Resonance and Q-Factor. Most questions come with a step-by-step solution you can work through free in PrepWiser.
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AC Circuits: R, L, C A capacitor of capacitance 100 μ F is charged to a potential of 12 V and connected to a… In a pure inductor, the current: An alternating emf E=110 √2 sin 100 t volt is applied to a capacitor of 2 μ F, the rms… An inductor of self inductance 1 H is connected in series with a resistor of 100 π ohm… An AC source is connected to an inductance of 100 mH, a capacitance of 100 μF and a… An alternating voltage source V=260 sin (628 t ) is connected across a pure inductor of… Given below are two statements : one is labelled as Assertion (A) and the other is… An inductance coil has a reactance of 100 Ω. When an AC signal of frequency 1000 Hz is… In the given circuit the AC source has ω = 100 rad s⁻¹. Considering the inductor and… The rms value of conduction current in a parallel plate capacitor is 6.9 μ A. The… A coil of negligible resistance is connected in series with 90 Ω resistor across 120 V… As per the given graph, choose the correct representation for curve A and curve B. Where… At very high frequencies, the effective impendence of the given circuit will be… For ac circuit shown in figure, R=100 k Ω and C=100 pF and the phase difference between… Match List - I with List - II List - I | List - II; (a) | Phase difference between… To light, a 50 W, 100 V lamp is connected, in series with a capacitor of capacitance… The effective current I in the given circuit at very high frequencies will be… In LC circuit the inductance L = 40 mH and capacitance C = 100 μF. If a voltage V(t) =… When a coil is connected across a 20 V dc supply, it draws a current of 5 A. When it is… Given below are two statements : Statement I : The reactance of an ac circuit is zero… Phasors and Impedance Power in AC Circuits An AC voltage V=20 sin 200 π t is applied to a series LCR circuit which drives a current… In a series LR circuit with X_L=R, power factor P₁. If a capacitor of capacitance C with… A LCR series circuit driven with Eᵣₘₛ=90 V at frequency f_d=30 Hz has resistance R=80Ω… In an a.c. circuit, voltage and current are given by: V=100 sin (100 t) V and I=100 sin… A series LCR circuit is connected to an AC source of 220 V, 50 Hz. The circuit contains… A direct current of 4 A and an alternating current of peak value 4 A flow through… A capacitor of reactance 4 √3 Ω and a resistor of resistance 4 Ω are connected in series… If wattless current flows in the AC circuit, then the circuit is : An inductor of 10 mH , capacitor of 0.1μ F and a resistor of 100Ω are connected in… An inductor of reactance 100 Ω, a capacitor of reactance 50 Ω, and a resistor of… An ac circuit has an inductor and a resistor resistance R in series, such that X L = 3R… The electric current in the circuit is given as i=iₒ(t/T). The r.m.s current for the… For the series LCR circuit connected with 220 V,50 Hz a.c source as shown in the figure… Two circuits are shown in the figure (a) & (b). At a frequency of ____________ rad/s the… The average power dissipated in a pure capacitor in an AC circuit is: A capacitor C is first charged fully with potential difference of V₀ and disconnected… In a series LR circuit, power of 400W is dissipated from a source of 250 V, 50 Hz. The… When a d c voltage of 100 V is applied to an inductor, a d c current of 5 A flows… The term cos φ in AC power is called: A series LCR circuit with R=20Ω,L=1.6H and C=40μ F is connected to a variable frequency… Transformers AC Voltage and Current Series RLC Circuit In an ac circuit, an inductor, a capacitor and a resistor are connected in series with X… An inductor of 0.5 mH, a capacitor of 200 μF and a resistor of 2 Ω are connected in… A sinusoidal voltage V(t) = 210 sin 3000 t volt is applied to a series LCR circuit in… An ac source is connected in given series LCR circuit. The rms potential difference… Given below are two statements: Statement I : When the frequency of an a.c source in a… An LCR circuit contains resistance of 110Ω and a supply of 220 V at 300 rad/s angular… A series LCR circuit consists of R=80 Ω, X_L=100 Ω, and X_C=40 Ω. The input voltage is… Find the peak current and resonant frequency of the following circuit (as shown in… In an LCR series circuit, an inductor 30 mH and a resistor 1 Ω are connected to an AC… A capacitor of capacitance 500 μF is charged completely using a dc supply of 100 V. It… A series LCR circuit has L=0.01 H, R=10 Ω and C=1 μ F and it is connected to ac voltage… The impedance of a series LCR circuit is: In a series LCR circuit, the inductance, capacitance and resistance are L = 100 mH, C =… A series L-C-R circuit is designed to resonate at an angular frequency ω₀ = 10⁵ rad/s… A LCR circuit behaves like a damped harmonic oscillator. Comparing it with a physical… In an LCR circuit with R=3 Ω, X_L=6 Ω, X_C=2 Ω, the impedance (in Ω) is: A series LCR circuit with L=100/π mH, C=10⁻³/π F and R=10 Ω, is connected across an ac… In a series LCR circuit, the inductive reactance (X L ) is 10Ω and the capacitive… Resonance and Q-Factor In a series LCR resonant circuit, the quality factor is measured as 100. If the… If R, X_L, and X_C represent resistance, inductive reactance and capacitive reactance… In an LC oscillator, if values of inductance and capacitance become twice and eight… An AC circuit has R= 100 Ω, C = 2 μF and L = 80 mH, connected in series. The quality… Given below are two statements : Statement I : In an LCR series circuit, current is… A transmitting station releases waves of wavelength 960 m. A capacitor of 2.56 μF is… An oscillating LC circuit consists of a 75 mH inductor and a 1.2 μ F capacitor. If the… An inductor of 0.5 mH, a capacitor of 20 μ F and resistance of 20 Ω are connected in… A 100Ω resistance, a 0.1 μF capacitor and an inductor are connected in series across a… A telegraph line of length 100 km has a capacity of 0.01 μF/km and it carries an… Match List - I with List - II List - I | List - II; (a) | ω L > 1/(ω C) | (i) | Current… An LCR series circuit of capacitance 62.5 nF and resistance of 50 Ω, is connected to an… In the circuit shown in the figure, the ratio of the quality factor and the band width… For a given series LCR circuit it is found that maximum current is drawn when value of… A series LCR circuit is connected to an ac source of 220 V, 50 Hz. The circuit contain a… A series LCR circuit with R = 250/11 Ω and X_L = 70/11 Ω is connected across a 220 V, 50… In a series LCR resonance circuit, if we change the resistance only, from a lower to… For a series LCR circuit, I vs ω curve is shown : (a) To the left of ωᵣ, the circuit is… The angular frequency of alternating current in a L-C-R circuit is 100 rad/s. The… A series LCR circuit driven by 300 V at a frequency of 50 Hz contains a resistance R = 3… More Physics chapters Frequently asked questions How many Alternating Current questions are there for JEE Main? PrepWiser has 144 Alternating Current questions for JEE Main, grouped into 7 topics such as AC Circuits: R, L, C, Phasors and Impedance and Power in AC Circuits.
Are these Alternating Current questions from previous-year JEE Main papers? Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.
Where can I see the answers and solutions to these Alternating Current questions? Open any Alternating Current question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.