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#1 Class 12 Physics Alternating Current 2019 Short 1M

Write the expression for the impedance of an L-R series circuit.

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#2 Class 12 Physics Alternating Current 2018 Short 1M

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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#3 Class 12 Physics Alternating Current 2019 Short 1M

Write the expression for the power factor of an L-R circuit.

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#4 Class 12 Physics Electromagnetic Induction 2022 Short 2M

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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#5 Class 12 Physics Electromagnetic Induction 2021 Short 2M

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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#6 Class 12 Physics Electromagnetic Induction 2020 Short 2M

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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#7 Class 12 Physics Electromagnetic Induction 2023 Short 3M

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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#8 Class 12 Physics Electromagnetic Induction 2021 Short 2M

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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#9 Class 12 Physics Electromagnetic Induction 2023 Short 3M

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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#10 Class 12 Physics Electromagnetic Induction 2022 Short 2M

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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#11 Class 12 Physics Electromagnetic Induction 2022 Short 2M

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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#12 Class 12 Physics Electromagnetic Induction 2021 Short 2M

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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#13 Class 12 Physics Electromagnetic Induction 2020 Short 2M

A metre-gauge train is running due north with a constant speed of 90 km/h on a horizontal track. If the vertical component of Earth's magnetic field is $3 \times 10^{-5}$ Wb/m$^2$, find the emf induced across the axle...

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#14 Class 12 Physics Electromagnetic Induction 2023 Short 3M

A coil is placed in a magnetic field decreasing at a rate of 10 T/s. There is also a source of emf 30 V in the coil (area = 2 m$^2$, resistance $R = 10\ \Omega$). Find the magnitude and direction of the current in the...

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#15 Class 12 Physics Electromagnetic Induction 2022 Short 2M

An 800-turn coil of effective area $0.05$ m$^2$ is kept perpendicular to a magnetic field $5 \times 10^{-5}$ T. When the plane of the coil is rotated by 90° around any of its coplanar axes in 0.1 s, find the emf induc...

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#16 Class 12 Physics Electromagnetic Induction 2021 Short 2M

A coil of resistance 400 $\Omega$ is placed in a magnetic field. The magnetic flux $\Phi$ (Wb) linked with the coil varies with time $t$ (s) as $\Phi = 50t^2 + 4$. Find the current in the coil at $t = 2$ s.

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#17 Class 12 Physics Electromagnetic Induction 2022 Long 5M

(a) Define mutual inductance and write its SI unit. (b) Two circular loops, one of small radius $r$ and other of larger radius $R$ ($R \gg r$), are placed coaxially with centres coinciding. Obtain the mutual inductanc...

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#18 Class 12 Physics Electromagnetic Induction 2021 Short 2M

In a coil of resistance 100 $\Omega$, a current is induced by changing the magnetic flux through it. The variation of current with time is as shown in the figure (current decreases linearly from 0.5 A to 0 in 0.2 s). ...

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#19 Class 12 Physics Electromagnetic Induction 2023 Long 5M

Explain briefly, with the help of a labelled diagram, the basic principle of working of an AC generator. Derive an expression for the instantaneous value of emf induced in a coil of $N$ turns, area $A$, rotating at an...

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#20 Class 12 Physics Electromagnetic Induction 2023 Short 3M

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 a current of 5 A. What will be the value of maximum emf generated?

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