CBSE Class 12th Physics Chapter 6 - Electromagnetic Induction Important Questions with Answers

You should focus on solving CBSE Class 12th Physics Chapter 6: Electromagnetic Induction important questions, especially to help you score high marks. By solving CBSE Class 12th Physics 6 questions, you will be solving exam-oriented questions only.

Never Miss an Exam Update

CBSE Class 12th Physics Chapter 6 - Electromagnetic Induction Important Questions with Answers: In CBSE Class 12 Physics Chapter 6 Electromagnetic Induction, students learn about different important topics such as Lenz's law, Faraday's laws, and electromagnetic induction formulas. Through the chapter, students will learn that initially, electricity and magnetism were considered separate. Then, Ampere and Oersted conducted experiments which demonstrated their interconnected nature. In the 1830s, Faraday and Henry also conducted experiments, which demonstrated changing magnetic fields could produce electric currents in closed coils. This helped in the development of generators and transformers, which revolutionized technology and gave birth to electricity, trains, telephones, lights, and computers. Overall, it helped in shaping modern civilisation. The students will also learn about the magnetic flux, AC generator, inductance, and more.

Check out the questions given below and practice answering them. The students can expect different types of short and long questions for different marks. Before writing answers, they should also check out the marks allotted in question papers.

Q.1 - How will a diamagnetic, paramagnetic and a ferromagnetic material behave when kept in a non-uniform external magnetic field? Give two examples of each of these materials. Name two main characteristics of a ferromagnetic material which help us to decide suitability for making. (i) Permanent magnet (ii) Electromagnet.

Q.2 - A short bar magnet placed with its axis at 30° with an external field 1000G experiences a torque of 0.02 Nm. (i) What is the magnetic moment of the magnet? (ii) What is the work done in turning it from its most stable equilibrium to its most unstable equilibrium position?

Q.3 - An electric bulb is connected in series with an inductor and an AC source. When the switch is closed and after sometime an iron rod is inserted into the interior of the inductor. How will the brightness of the bulb be affected? Justify your answer.

Q.4 - How does the mutual inductance of a pair of coils change when

(i) distance between the coils is increased and

(ii) number of turns in the coils is increased

Q.5 - The motion of copper plates is damped when it is allowed to oscillate between the two poles of a magnet. If slots are cut in the plate, how will the damping be affected?

Are you feeling lost and unsure about what career path to take after completing 12th standard?

Say goodbye to confusion and hello to a bright future!

Was this article helpful?

0 Upvotes

0 Downvotes

Predict the polarity of the capacitor in the situation described in the given diagram. (All India 2017)

Question 2.

A bar magnet is moved in the direction indicated by the arrow between two coils PQ and CD. Predict the direction of the induced current in each coil (All India 2017)
Important Questions for Class 12 Physics Chapter 6 Electromagnetic Induction Class 12 Important Questions 13

Important Questions for Class 12 Physics Chapter 6 Electromagnetic Induction Class 12 Important Questions 13

Question 3.

What is the direction of induced currents in metal rings 1 and 2 when current I in the wire is increasing steadily? (All India 2017)
Important Questions for Class 12 Physics Chapter 6 Electromagnetic Induction Class 12 Important Questions 97

Important Questions for Class 12 Physics Chapter 6 Electromagnetic Induction Class 12 Important Questions 97

Question 4.

In the figure given, mark the polarity of plates A and B of a capacitor when the magnets are quickly moved towards the coil. (Comptt. All India 2017)

Question 5.

(a) Define the term ‘self-inductance’ and write its S.I. unit.
(b) Obtain the expression for the mutual inductance of two long co-axial solenoids S₁ and S₂ wound one over the other, each of length L and radii r₁ and r₂ and n₁ and n₂ number of turns per unit length, when a current I is set up in the outer solenoid S₂. (Delhi 2017)

Question 6.

Define mutual inductance between a pair of coils. Derive an expression for the mutual inductance of two long coaxial solenoids of same length wound one over the other. (All India 2017)

Question 7.

Define self-inductance of a coil. Obtain the expression for the energy stored in an inductor L connected across a source of emf. (All India 2017)

Question 8.

State Lenz’s law. Explain, by giving examples that Lenz’s law is a consequence of conservation of energy. (Comptt. Delhi 2017)

Question 9.

The current through two inductors of self-inductance 12 mH and 30 mH is increasing with time at the same rate. Draw graphs showing the variation of the
(a) emf induced with the rate of change of current in each inductor
(b) energy stored in each inductor with the current flowing through it.
Compare the energy stored in the coils, if the power dissipated in the coils is the same. (Comptt. All India 2017)

Question 10.

The current through two inductors of self-inductance 15 mH and 25 mH is increasing with time at the same rate. Draw graphs showing the variation of the
(a) emf induced with the rate of change of current
(b) energy stored in each inductor with the current flowing through it.
Compare the energy stored in the coils, if the power dissipated in the coils is the same. (Comptt. All India 2017)

Question 1.

(a) Explain the meaning of the term mutual inductance. Consider two concentric circular coils, one of radius r₁ and the other of radius r₂ (r₁< r₂) placed coaxially with centres coinciding with each other. Obtain the expression for the mutual inductance of the arrangement.
(b) A rectangular coil of area A, having number of turns N is rotated at ‘f revolutions per second in a uniform magnetic field B, the field being perpendicular to the coil. Prove that the maximum emf induced in the coil is 2?f. (All India 2016)

Question 2.

(a) A metallic rod of length l is moved perpendicular to its length with velocity v in a magnetic field \(\overrightarrow{\mathrm{B}}\) acting perpendicular to the plane in which rod moves. Derive the expression for the induced emf.
(b) A wheel with 15 metallic spokes each 60 cm long, is rotated at 360 rev/min in a place normal to the horizontal component of earth’s magnetic field. The angle of dip at that place is 60°. If the emf induced between rim of the wheel and the axle is 400 mV, calculate the horizontal component of earth’s magnetic field at the place.
How will the induced emf change, if the number of spokes is increased? (Comptt. All India 2016)

Question 3.

Define the term ‘self-inductance’ of a coil. Write its S.I. Unit. (All India 2015)

Question 4.

Name any two applications where eddy currents are used to advantage. (Comptt. Delhi 2015 )

Question 5.

A long straight current carrying wire passes normally through the centre of a circular loop. If the current through the wire increases, will there be an induced emf in the. loop? Justify. (Delhi 2015)

Question 6.

Derive the expression for the magnetic energy stored in a solenoid in terms of magnetic field B, area A and length l of the solenoid carrying a steady current I. How does this magnetic energy per unit volume compare with the electrostatic energy density stored in a parallel plate capacitor? (Comptt. Delhi 2015)

Question 7.

(i) Define mutual inductance.
(ii) A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, what is the change of flux linkage with the other coil? (Delhi 2015)

Question 8.

(a) Define self-inductance of a coil and hence write the definition of ‘Henry’.
(b) Write any two factors each on which the following depends :
(i) Self inductance of a coil.
(ii) mutual inductance of a pair of coils. (Comptt. All India 2015)

Question 9.

Define mutual inductance of a pair of coils and write on which factors does it depend.
A square loop of side 20 cm is initially kept 30 cm away from a region of uniform magnetic field of 0.1 T as shown in the figure. It is then moved towards the right with a velocity of 10 cm s^-1 till it goes out of the field.
Important Questions for Class 12 Physics Chapter 6 Electromagnetic Induction Class 12 Important Questions 88

Important Questions for Class 12 Physics Chapter 6 Electromagnetic Induction Class 12 Important Questions 88

Plot a graph showing the variation of
(i) magnetic flux (?) through the loop with time (t)
(ii) induced emf (?) in the loop with time t.
(iii) induced current in the loop if it has resistance of 0.1 ?. (Comptt. All India 2015)

Question 10.

Two spherical bobs, one metallic and the other of glass, of the same size are allowed to fall freely from the same height above the ground. Which of the two would reach earlier and why? (Delhi 2014)