CBSE Class 12 Physics EMI and AC Assignment

Official CBSE Assignments for Class 12 Physics

Access comprehensive school assignments for Chapter 06 Electromagnetic Induction using the CBSE Class 12 Physics EMI and AC Assignment. Designed to align with the 2026-27 CBSE academic guidelines, these practice sets help Class 12 Physics students reinforce core concepts and improve their problem-solving accuracy.

Solved Practice Assignments for Physics

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EMI And AC MCQ Questions with Answers Class 12 Physics

Question- An ideal capacitor of capacitance 0.2μF is charged to a potential difference of 10 V. The charging battery is then disconnected. The capacitor is then connected to an ideal inductor of self inductance 0.5 mH. The current at a time when the potential difference across the capacitor is 5 V, is : 
(a) 0.34 A
(b) 0.25 A
(c) 0.17 A
(d) 0.15 A
Ans-(c)
 
Question- Microwave oven acts on the principle of :
(a) transferring electrons from lower to higher energy levels in water molecule
(b) giving rotational energy to water molecules
(c) giving vibrational energy to water molecules
(d) giving translational energy to water molecules
Ans-(c)
 
Question- For LED’s to emit light in visible region of electromagnetic light, it should have energy band gap in the range of: 
(a) 0.9 eV to 1.6 eV
(b) 0.1 eV to 0.4 eV
(c) 1.7 eV to 3.0 eV
(d) 0.5 eV to 0.8 eV
Ans-(c)
 
Question-A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100 W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 5 m from the lamp will be nearly. 
(a) 2.68 V/m
(b) 1.34 V/m
(c) 4.02 V/m
(d) 5.36 V/m
Ans-(a)
 
Question-Long range radio transmission is possible when the radiowaves are reflected from the ionosphere. For this to happen the frequency of the radiowaves must be in the range : 
(a) 8 – 25 MHz
(b) 80 – 150 MHz
(c) 150 – 500 kHz
(d) 1 – 3 MHz
Ans-(a)
 
Question- If denote microwaves, X rays, infrared, gramma rays, ultraviolet, radio waves and visible parts of the electromagnetic spectrum by M, X, I, G, U, R and V, the following is the arrangement in ascending order of wavelength :
(a) I, M, R, U, V, X and G
(b) R, M I, V, U, X and G
(c) M, R, V, X, U, G and I
(d) G, X U, V, I, M and R
Ans-(d)
 
Question- An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to :
(a) 0.08 H
(b) 0.044 H
(c) 0.065 H
(d) 80 H
Ans-(c)
 
Question- During the propagation of electromagnetic waves in a medium :
(a) Electric energy density is half of the magnetic energy density.
(b) Electric energy density is equal to the magnetic energy density.
(c) Both electric and magnetic energy densities are zero.
(d) Electric energy density is double of the magnetic energy density.
Ans-(b)
 
Question-The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field stength is 
(a) 3V/m
(b) 6V/m
(c) 9V/m
(d) 12V/m
Ans-(b)
 
Question- An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery of 5 V. 2 s after the connection is made,the current flowing (in ampere) in the circuit is
(a) (1 – e)
(b) e
(c) e –1
(d) (1 – e–1)
Ans-(d)
 
Question-A long solenoid has 200 turns/cm and carries a current I. The magnetic field at its centre is 6.28 × 10–4 Wb/m2. Another long solenoid has 100 turns/cm and it carries a current 1/3.The value of the magnetic field at its centre is
(a) 1.05 × 10–2 Wb/m2
(b) 1.05 × 10–5 Wb/m2
(c) 1.05 × 10–3 Wb/m2
(d) 1.05 × 10–4 Wb/m2
Ans-(d)
 
Question- Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon
(a) the rates at which currents are changing in the two coils
(b) relative position and orientation of the two coils
(c) the materials of the wires of the coils
(d) the currents in the two coils
Ans-(b)
 
Question-When the current changes from + 2 A to –2 A in 0.05 s, an emf of 8 V is induced in a coil. The coefficient of selfinduction of the coil is 
(a) 0.2 H
(b) 0.4 H
(c) 0.8 H
(d) 0.1 H
Ans-(d)
 
Question-If a current is passed through a spring then the spring will 
(a) expand
(b) compress
(c) remain same
(d) None of the above
Ans-(b)
 
Question-A physicist works in a laboratory where the magnetic field is 2 T. She wears a necklace enclosing area 0.01 m2 in such a way that the plane of the necklace is normal to the field and is
having a resistance R = 0.01 Ω. Because of power failure, the field decays to 1 T in time 10–3 seconds. Then what is the total heat produced in her necklace ? (T = Tesla)
(a) 10 J
(b) 20 J
(c) 30 J
(d) 40 J
Ans-(a)
 
Question- Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then
(a) Current in each loop increases
(b) Current in each loop remains the same
(c) Current in each loop decreases
Ans-(c)
 
Question- A conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01Telsa oscillating with frequency 100Hz with its plane at right angles to B. What will be the maximum induced electric field
(a) πvolt/m
(b) 2volt/m
(c) 10volt/m
(d) 62volt/m
Ans-(a)
 
Question-A coil has an inductance of 0.7 H and is joined in series with a resistance of 220 Ω. When an alternating emf of 220 V at 50 cps is applied to it, then the wattless component of the current in the circuit is
(a) 5A
(b) 0.5 A
(c) 0.7 A
(d) 7 A
Ans-(b)
 
Question- An rms voltage of 110 V is applied across a series circuit having a resistance 11 Ω and an impedance 22 Ω. The power consumed is
(a) 275 W
(b) 366 W
(c) 550 W
(d) 1100 W
Ans-(a)

 

More question-

 

Q1- Two identical loops,one of copper and another of constanton,are removed from a magnetic field within the same time interval.In which loop the induced current will be greater?

Q2- 

CBSE Class 12 Physics EMI and AC Assignment

B In the wire AB current is decreasing.What is the directrion of induced Current in the square loop?

Q3- Define the term self inductance. Write its SI unit.

Q4- Find the capacitance of the capacitor that would have the reactance of 100ohm when used with an ac source of frequency5/π KHZ.

Q5- Current and voltage in the circuit are I=10 Sin 314t and V=50 Sin (314t + π/2)V. What is the power dissipation in the circuit?

Q6- A conducting rod of length l,with one end pivoted, is rotated with a uniform angular speed w in a vertical plane, normal to the uniform magnetic field B. Deduce an expression for the emf induced in this rod.

Q7.- 

CBSE Class 12 Physics EMI and AC Assignment-

(A) Find the induced current in the circuit. R L V (B) Find the minimum force required for pulling the Sliding arm with constant speed v.

Q8. An electric heater is connected ,turn by turn, to a dc and ac sources of equal voltages. Will the rate of heat production be same in two cases? Explain.

Q9- Prove that in a series LCR circuit, the power dissipated depends not only on the voltage and current but also on the cosine of the phase angle Φ between these two

Q10- Prove that on applying an ac across an inductor voltage leads to current by phase π/2 radian.

Q11. An alternating voltage of frequency f is applied across a series LCR circuit.Let fr be the resonance frequency.Will the current in the circuit lag,lead or remain in phase with the applied voltage when (a)f>fr (b) f < fr Explain your answer in each case.

Q12.(A) Plot a graph showing variation of current with frequency of ac source in a series LCR
circuit.(B)Plot a graph showing the variation of impedence of a series LCR circuit with the
frequency of applied ac source.

Q13.When a series combination of L and R are connected with a 10v,50hz,ac source, a current of
1amp flows in the circuit. The voltage leads the current by a phase angle of π/3 radian. Calculate
the value of L and R.

Q14.Write the principle of transformer. Prove that in a step up transformer current decreases
across the secondary .Why we transmit the power at high voltage?

Q15-Write the principle and working of ac generator.

Q16-(A) Derive an expression for self inductance of a coil.
(B)There are two concentric loop of radius r and R (r<<R).Derive an expression for mutual
inductance of the coils. (2)

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Chapter 06 Electromagnetic Induction Printable Assignments & Solutions for Class 12 Physics

Download Assignment: Chapter 06 Electromagnetic Induction (Class 12 Physics)

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Are the assignments for Class 12 Physics Chapter 06 Electromagnetic Induction based on the 2026 exam pattern?

Yes. These assignments are designed as per the latest CBSE syllabus for 2026. We have included huge variety of question formats such as MCQs, Case-study based questions and important diagram-based problems found in Chapter 06 Electromagnetic Induction.

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