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#1 Class 12 Physics Alternating Current 2022 Mcq 1M CBSE
In an LCR series circuit, inductive reactance = 50 $\Omega$, capacitive reactance = 35 $\Omega$, resistance = 20 $\Omega$. The impedance of the circuit is
A. 15 $\Omega$
B. 25 $\Omega$
C. 35 $\Omega$
D. 45 $\Omega$
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#2 Class 12 Physics Alternating Current 2019 Mcq 1M CBSE
In an LCR series AC circuit, the voltage across each of the components L, C and R is 50 V. The voltage across the LC combination will be
A. zero
B. 50 V
C. $50\sqrt{2}$ V
D. 100 V
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#3 Class 12 Physics Alternating Current 2021 Mcq 1M CBSE
Reactance of a capacitor of capacitance $C$ for an alternating current of frequency $\frac{400}{\pi}$ Hz is 25 $\Omega$. The value of $C$ is
A. 25 $\mu$F
B. 50 $\mu$F
C. 75 $\mu$F
D. 100 $\mu$F
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#4 Class 12 Physics Alternating Current 2020 Mcq 1M CBSE
The value of current flowing through an inductor of inductance 1 H with negligible resistance when connected to an AC source of 200 V and 50 Hz is
A. 0.64 A
B. 1.64 A
C. 2.64 A
D. 3.64 A
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#5 Class 12 Physics Alternating Current 2018 Mcq 1M CBSE
In an AC circuit containing only a capacitor, the current
A. leads the voltage by 90°
B. leads the voltage by 180°
C. lags behind the voltage by 90°
D. remains in phase with the voltage
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#6 Class 12 Physics Alternating Current 2019 Mcq 1M CBSE
In a circuit, the current lags behind the voltage by a phase difference of $\pi/2$ radians. The circuit contains
A. only R
B. only L
C. only C
D. R and C
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#7 Class 12 Physics Alternating Current 2021 Mcq 1M CBSE
The peak voltage of an AC source is 440 V. Its virtual (rms) voltage is
A. 220 V
B. 440 V
C. $220\sqrt{2}$ V
D. $440\sqrt{2}$ V
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#8 Class 12 Physics Alternating Current 2020 Short 1M CBSE
What is the ratio of peak value to rms value of AC?
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#9 Class 12 Physics Alternating Current 2019 Short 1M CBSE
Write the expression for the impedance of an L-R series circuit.
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#10 Class 12 Physics Alternating Current 2018 Short 1M CBSE
If $N_1$ and $N_2$ are the number of turns in the primary and secondary coils of a step-up transformer, write the relation between them.
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#11 Class 12 Physics Alternating Current 2019 Short 1M CBSE
Write the expression for the power factor of an L-R circuit.
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#12 Class 12 Physics Electromagnetic Induction 2022 Short 2M CBSE
Kamla pedals a stationary bicycle. The pedals are attached to a 100-turn coil of area 0.10 m$^2$. The coil rotates at half a revolution per second in a uniform magnetic field of 0.01 T perpendicular to the axis of rot...
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#13 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE
Two coils have a mutual inductance of 0.005 H. The current in the first coil changes as $I = I_m\sin\omega t$, where $I_m = 10$ A and $\omega = 100\pi$ rad/s. Find the maximum value of emf induced in the second coil.
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#14 Class 12 Physics Electromagnetic Induction 2020 Short 2M CBSE
An emf of 0.5 V is developed in the secondary coil when current in the primary coil changes from 5 A to 2 A in 300 milliseconds. Calculate the mutual inductance of the two coils.
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#15 Class 12 Physics Electromagnetic Induction 2023 Short 3M CBSE
If $R = 2\ \Omega$, $E = 24$ V, $L = 4$ H, $I = 10$ A decreasing at rate of 0.5 A/s, find the potential difference $V_K - V_M$.
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#16 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE
The figure shows the variation of induced emf as a function of rate of change of current for two identical solenoids X and Y. One is air-cored and the other is iron-cored. Which one is iron-cored? Why?
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#17 Class 12 Physics Electromagnetic Induction 2023 Short 3M CBSE
The energy stored in a solenoid of inductance $L$ is $U$. The number of turns per unit length of the solenoid is doubled, keeping current and all other factors same. Find: (a) change in inductance, (b) final energy st...
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#18 Class 12 Physics Electromagnetic Induction 2022 Short 2M CBSE
Find the induced emf for the configuration shown in the figure. (Refer to figure in document for specific circuit/coil configuration and values.)
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#19 Class 12 Physics Electromagnetic Induction 2022 Short 2M CBSE
A thin semicircular conducting ring PQR of radius $R$ is falling with its plane vertical in a horizontal magnetic field $B$. Find the potential difference developed across the ring when its speed is $v$.
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#20 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE
Find the current in the 5 $\Omega$ resistor. Given $B = 0.4$ T, length of RS = 25 cm. (Rod RS moves with velocity $v$ in the circuit — refer to figure for exact configuration.)
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