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#1 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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#2 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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#3 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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#4 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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#5 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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#6 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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#7 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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#8 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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#9 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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#10 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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#11 Class 12 Physics Electromagnetic Induction 2020 Short 2M CBSE

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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#12 Class 12 Physics Electromagnetic Induction 2023 Short 3M CBSE

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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#13 Class 12 Physics Electromagnetic Induction 2022 Short 2M CBSE

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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#14 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE

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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#15 Class 12 Physics Electromagnetic Induction 2022 Long 5M CBSE

(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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#16 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE

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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#17 Class 12 Physics Electromagnetic Induction 2023 Long 5M CBSE

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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#18 Class 12 Physics Electromagnetic Induction 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 a current of 5 A. What will be the value of maximum emf generated?

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#19 Class 12 Physics Electromagnetic Induction 2022 Short 3M CBSE

A solenoid has a core of material with relative permeability 200. The windings carry a current of 1 A and the number of turns is 2000 per metre. Calculate: (A) magnetic intensity $H$, (B) magnetic field $B$, (C) magne...

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#20 Class 12 Physics Electromagnetic Induction 2022 Mcq 1M CBSE

Two small identical magnets are allowed to fall freely — one through a vertical solenoid made of copper and another in air through the same distance. The time taken by the two magnets to fall will be

A. same in both cases

B. more for the magnet falling in air

C. more for the magnet falling through the solenoid

D. infinite

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