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#1 Class 12 Physics Alternating Current 2025 Short 3M CBSE

A series combination of circuit elements X and Y is connected across an ac source. It is found that the voltage is ahead of current in phase by radian. When element Y is replaced by element Z, the current leads the vo...

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#2 Class 12 Physics Alternating Current 2025 Long 5M CBSE

(i) A light bulb and an open coil inductor are connected in series across an ac source of variable frequency. How will the glow of the bulb be affected when : (I) an iron bar is inserted inside the coil, and (II) the ...

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#3 Class 12 Physics Alternating Current 2025 Short 3M CBSE

(i) a dc source, and (ii) a high frequency ac source. (a) Discuss the behaviour of an inductor connected to (b) What is the phase relation between current and voltage in an ideal inductor connected to an ac source ? D...

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#4 Class 12 Physics Alternating Current 2025 Long 5M CBSE

(i) rms value of the applied voltage. (ii) the frequency of ac supply. (iii) (a) Define mutual inductance. Give its units. State two factors on which the mutual inductance between a given pair of coils depends. (a) (a...

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#5 Class 12 Physics Alternating Current 2025 Short 5M CBSE

(i) With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator. (ii) Deduce an expression for the induced emf in the coil of the generator. (iii) If T is the time period ...

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#6 Class 12 Physics Alternating Current 2025 Mcq 1M CBSE

In a series LCR circuit, the voltage across the resistor, capacitor and inductor is 10 V each. If the capacitor is short circuited, the voltage across the inductor will be

A. 10 V

B. 5 2 V

C. V

D. 10 2 V

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#7 Class 12 Physics Electromagnetic Induction 2025 Mcq 1M CBSE

A rectangular loop of size 5 cm × 8 cm is lying in x-y plane in a uniform magnetic field B = (2.0 T) k . The total magnetic flux linked with the loop is :

A. 80 Wb

B. 16 Wb

C. $8 \times 10^{-2}$ Wb

D. $8 \times 10^{-3}$ Wb

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#8 Class 12 Physics Electromagnetic Induction 2025 Short 2M CBSE

A plane circular coil is rotated about its vertical diameter with a constant angular speed in a uniform horizontal magnetic field. Initially the plane of the coil is parallel to the magnetic field. Draw plots showing ...

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#9 Class 12 Physics Electromagnetic Induction 2025 Long 1M CBSE

Assertion (A) : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R) : Induced emf produced is directly proportional to the magnetic flux.

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#10 Class 12 Physics Electromagnetic Induction 2025 Mcq 1M CBSE

The magnetic flux through a loop placed in a magnetic field can be changed by changing :

A. area of the loop only

B. the value of magnetic field only

C. orientation of the loop in the magnetic field only

D. any one or more of the factors given in (A), (B) and (C)

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#11 Class 12 Physics Electromagnetic Induction 2025 Short 3M CBSE

Two coils, one of radius 0.5 cm having 10 turns and the other of radius 5 cm having 50 turns are placed coaxially in air such that their centres are coincident. Calculate : (a) the magnetic flux through the smaller co...

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#12 Class 12 Physics Electromagnetic Induction 2025 Mcq 1M CBSE

Two coils are placed closed to each other. The mutual inductance of the pair of coils depends upon the :

A. rate at which currents change in the two coils

B. relative position and orientation of the coils

C. currents in the two coils

D. value of voltage induced in one coil due to change in value of current in the other coil

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#13 Class 12 Physics Electromagnetic Induction 2025 Short 3M CBSE

A conducting rectangular loop of area 5 $cm^2$ and resistance 4 is removed from a region of uniform magnetic field, acting normal to the plane of the loop. The value of induced current I in the loop varies with time t...

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#14 Class 12 Physics Electromagnetic Induction 2025 Short 3M CBSE

The figure given below shows a square-shaped loop MNOP of side 25 cm placed horizontally in a uniform magnetic field B directed vertically downward. The position of the loop at t = 0 s is as shown in figure. The loop ...

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#15 Class 12 Physics Electromagnetic Induction 2025 Mcq 1M CBSE

The dimensions of the rate of change of magnetic flux are :

A. [M L $T^{-3}$ A]

B. [M L$_{2}$ $T^{-3}$ $A^{-1}$]

C. [M L$_{2}$ $T^{-2}$ $A^{-1}$]

D. [M L$_{2}$ $T^{-3}$ $A^{-2}$] (A) −i (B) −j (C) k (D) j

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#16 Class 12 Physics Electromagnetic Induction 2025 Short 3M CBSE

State Faraday’s law of electromagnetic induction. Briefly describe two methods for producing induced emf.

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#17 Class 12 Physics Electromagnetic Induction 2025 Mcq 1M CBSE

A square loop of side L lies in the x-y plane in a magnetic field B = B$_{0}$(2 i + 3 j + 4 k ), where B$_{0}$ is a constant. The magnetic flux through the loop is :

A. 29 B$_{0}$ L$_{2}$

B. 4 B$_{0}$ L$_{2}$

C. 3 B$_{0}$ L$_{2}$

D. 2 B$_{0}$ L$_{2}$

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#18 Class 12 Physics Electromagnetic Induction 2025 Mcq 1M CBSE

Figure shows a magnet dropped through a small loop with a small cut. Which of the following statements is correct ?

A. The speed of the falling magnet increases as it approaches the loop and starts decreasing as it crosses the loop

B. Acceleration of magnet increases as it approaches the loop and starts decreasing as it crosses the loop

C. Speed of magnet remains uniform as it moves through the loop

D. Acceleration of the magnet remains uniform as it moves through the loop

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#19 Class 12 Physics Electromagnetic Induction 2025 Mcq 1M CBSE

The magnetic flux (in Wb) linked with a coil is related to time t (in s) as = 5 At2 + Bt – 2C The SI units of A and B are respectively

A. Wbs2, Wbs

B. Wb $s^{-1}$, Wb

C. Wbs–2, Wbs–1

D. Wbs–1, Wbs–2

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#20 Class 12 Physics Magnetism and Matter 2025 Short 2M CBSE

A light copper ring is freely suspended by a light string. A bar magnet is held horizontally with its length along the axis of the ring. The magnet is moved towards the ring with its N pole facing the loop. What will ...

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