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#1 Class 12 Physics Alternating Current 2021 Short 2M CBSE
A step-up transformer operates on a 220 V line and supplies a load of 2 A. The ratio of primary to secondary windings is 1:25. Find the current in the primary.
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#2 Class 12 Physics Alternating Current 2020 Short 2M CBSE
A resistance $R$ draws power $P$ when connected to an AC source. If an inductance is placed in series with $R$ such that impedance becomes $Z$, what is the power drawn?
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#3 Class 12 Physics Alternating Current 2022 Short 2M CBSE
The potential differences across resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an LCR circuit. Find the power factor of this circuit.
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#4 Class 12 Physics Alternating Current 2021 Short 2M CBSE
In a given circuit, the readings of voltmeters $V_1$ and $V_2$ are 300 V each. What are the readings of voltmeter $V_3$ and ammeter $A$? ($R = 100\ \Omega$, $X_L = X_C = 300\ \Omega$, series LCR circuit with 300 V sou...
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#5 Class 12 Physics Alternating Current 2022 Short 3M CBSE
An AC source of 200 V, 50 Hz is connected in series with a 300 $\Omega$ resistor and a capacitor of $\frac{25}{\pi}\ \mu$F. Calculate: (a) the reactance, (b) impedance, and (c) current in the circuit.
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#6 Class 12 Physics Alternating Current 2021 Short 2M CBSE
A coil has resistance 30 $\Omega$ and inductive reactance 20 $\Omega$ at 50 Hz. If an AC source of 200 V at 100 Hz is connected across the coil, find the current in the coil.
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#7 Class 12 Physics Alternating Current 2019 Short 1M CBSE
An AC voltage is applied to a resistance $R$ and an inductor $L$ in series. If $R$ and the inductive reactance are both equal to 3 $\Omega$, the phase difference between the applied voltage and the current in the circ...
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#8 Class 12 Physics Alternating Current 2020 Short 2M CBSE
A coil of inductance $\frac{4}{\pi}$ H is connected in series with a resistance of 30 $\Omega$. Calculate the current flowing when connected to AC mains of 200 V and 50 Hz.
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#9 Class 12 Physics Alternating Current 2022 Short 2M CBSE
In an AC circuit, alternating voltage $e = 200\sqrt{2}\sin(100t)$ V is connected to a capacitor of capacity 1 $\mu$F. Find the rms value of current in the circuit.
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#10 Class 12 Physics Alternating Current 2021 Short 2M CBSE
An alternating emf $E = 100\sin\left(100\pi t + \frac{\pi}{3}\right)$ V is applied across a pure inductor $L = \frac{2}{\pi}$ H. Find the expression of alternating current.
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#11 Class 12 Physics Alternating Current 2023 Short 3M CBSE
A conducting coil of 50 turns and area $\frac{5}{\pi}$ cm$^2$ is rotating along the axis of a solenoid of length 50 cm and 2000 turns, carrying current of 5 A. What will be the value of maximum emf generated?
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#12 Class 12 Physics Alternating Current 2019 Short 2M CBSE
The emf generated by an AC generator is given by $V = V_0\sin(\omega t)$, where $\omega$ is the angular frequency. What will be the emf if the angular frequency is doubled?
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#13 Class 12 Physics Alternating Current 2020 Short 2M CBSE
An electric lamp is connected in series with a capacitor and an AC source and is glowing with certain brightness. How does the brightness of the lamp change on reducing (i) the capacitance, (ii) the frequency?
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#14 Class 12 Physics Alternating Current 2021 Short 3M CBSE
Show that the current leads the voltage in phase by $\pi/2$ in an AC circuit containing an ideal capacitor.
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#15 Class 12 Physics Alternating Current 2023 Short 3M CBSE
Calculate the quality factor of a series LCR circuit with $L = 2.0$ H, $C = 2\ \mu$F and $R = 10\ \Omega$. Mention the significance of quality factor in an LCR circuit.
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#16 Class 12 Physics Alternating Current 2022 Short 5M CBSE
A circular coil of radius 10 cm and 20 turns is rotated about its vertical diameter with angular speed 50 rad/s in a uniform horizontal magnetic field of $3.0 \times 10^{-2}$ T. (i) Calculate the maximum and average e...
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#17 Class 12 Physics Alternating Current 2021 Short 3M CBSE
(a) Explain the term 'sharpness of resonance' in an AC circuit. (b) In a series LCR circuit, $V_L = V_C \neq V_R$. What is the value of power factor for this circuit?
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#18 Class 12 Physics Alternating Current 2023 Short 3M CBSE
The coil of an AC generator has 100 turns, each of area 0.5 m$^2$. The resistance of the wire is 100 $\Omega$. The coil rotates in a magnetic field of 0.8 T perpendicular to its axis at a constant angular speed of 60 ...
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#19 Class 12 Physics Alternating Current 2022 Short 3M CBSE
An alternating voltage $E = E_0\sin(\omega t)$ is applied to a circuit containing a resistor $R$ in series with a black box. The current is found to be $I = I_0\sin(\omega t + \pi/4)$. (i) State whether the element in...
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#20 Class 12 Physics Alternating Current 2014 Short 2M CBSE
Why is the use of AC voltage preferred over DC voltage? Give two reasons.
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