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NCERT Solutions For Class 12 Physics Chapter 6: Electromagnetic Induction

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Jasmine Grover

Education Journalist | Study Abroad Lead

NCERT Solutions for Class 12 Physics Chapter 6 Electromagnetic Induction are provided in this article. Electromagnetic Induction is a current produced due to the production of voltage (electromotive force) as a result of a changing magnetic field. The production of voltage is further influenced by many factors.

Chapter 6 Electromagnetic Induction is a part of Unit 4 Electromagnetic Induction and Alternating Currents which along with Unit 3 Magnetic Effects of Current and Magnetism has a weightage of 17 marks in the CBSE Class 12 Examination. The NCERT Solutions for Class 12 Physics Chapter 6 deals with concepts of electromagnetic induction formula, inductance applications of electromagnetic induction, eddy currents, etc.

Download PDF: NCERT Solutions for Class 12 Physics Chapter 6

NCERT Solutions for Class 12 Physics Chapter 6

NCERT solutions for class 12 physics chapter 6 Electromagnetic Induction are given as below – 

NCERT Solutions Chapter 6

NCERT Solutions

NCERT Solutions

NCERT Solutions

NCERT Solutions

NCERT Solutions

NCERT Solutions

NCERT Solutions

NCERT Solutions

Read More: Electromagnetic Induction MCQ

Previous Year Questions

Questions on Lenz Law :

  1. Lenz’s law is consequence of the law of conservation of….. [UPSEE 2019]
  2. The magnetic field is increasing at a constant rate. The directions of induced current in wires AB and CD  are…. [VITEEE 2019]
  3. the circular loop of wire is moved with velocity towards the infinite current carrying wire…… [VITEEE 2016]
  4. Two identical coaxial coils P and Q  carrying equal amount of current in the same direction are brought nearer. The current in...[KEAM]
  5. The polarity of induced emf is given by….[KEAM]

Questions on Electromagnetic Induction:

  1.  If a transformer of an audio amplifier has output impedance 8000 0 and the speaker has input impedance…...[JCECE 2005]
  2. A conducting loop in the shape of a right angled isosceles triangle of height 10cm10cm is kept such that the 90∘ vertex is…..[JEE Advance 2016]
  3. A 10m long horizontal wire extends from North East to South West. It is falling with a speed of 5.0ms−1……. [ JEE Main 2019]
  4. If a current of 2.0A2.0A flows through the smaller loop, then the flux linked with bigger loop is…… [JEE Main 2013]
  5. A coil of cross-sectional area A having n turns is placed in a uniform magnetic field B….. [JEE Main 21018]
  6. A copper rod of mass m slides under gravity on two smooth parallel rails, with separation ll and set at an angle of θ with the horizontal….. [JEE Main 2018]
  7. A copper wire is wound on a wooden frame, whose shape is that of an equilateral…. [JEE Main 2019]
  8. A metallic rod of length ll is tied to a string of length 2l and made to rotate with angular speed…. [JEE Main 2013]
  9. A square frame of side 10 cm and a long straight wire carrying current 1 A are in the plane of the paper…. [JEE Main 2014]
  10. If the rod makes n rotations per second, then the time averaged magnetic moment of the rod is… [JEE Main 2019]
  11. Figure shows a circular area of radius R where a uniform magnetic field….
  12. In a coil of resistance 100Ω , a current is induced by changing the magnetic flux through it….. [JEE Main 2017]
  13. When current in a coil changes from 5A  to 2A…. [JEE Main 2015]

Questions on Faradays laws of induction:

  1. Two identical circular coils A and B are kept on a horizontal tube side by side without touching each other…. [KCET 2013]
  2. The magnetic flux through a circuit of resistance RR changes by an amount….[NEET 2004]
  3. A conducting loop in the shape of a right angled isosceles triangle of height...[JEE Advance 2016]
  4. If a transformer of an audio amplifier has output impedance…..[JCECE]

Class 12 Physics Chapter 6 Electromagnetic Induction – Important Topics

  • Electromagnetic Induction is the current that is produced by electromotive force or EMF when a magnetic field is continuously changing.
According to Faraday’s law, the amount of voltage that is induced in a coil is proportional to the number of turns of the coil and the rate of changing the magnetic field.
  • When e refers to the induced voltage, N to the number of turns in a coil, Φ is the magnetic flux, and t is time, then the voltage that is induced can be found by – 
e = N × dΦ/dt
  • The production of voltage is influenced by various factors such as – the number of coils and changing magnetic field.
  1. Number of Coils: The induced voltage is directly proportional to the number of coils of the wire. 
  2. Changing Magnetic Field: Changing magnetic field also affects the induced voltage by either moving magnetic field around the conductor or moving the conductor in the magnetic field.

  • Electromagnetic Induction is produced when we either place the conductor in a changing magnetic field or the conductor constantly moves in a stationary field.

Electromagnetic induction is used in the working of an AC generator and transformers.

Previous Year Questions

Questions on Lenz Law:

  1. Lenz’s law is consequence of the law of conservation of….. [UPSEE 2019]
  2. The magnetic field is increasing at a constant rate. The directions of induced current in wires AB and CD  are…. [VITEEE 2019]
  3. the circular loop of wire is moved with velocity towards the infinite current carrying wire…… [VITEEE 2016]
  4. Two identical coaxial coils P and Q  carrying equal amount of current in the same direction are brought nearer. The current in...[KEAM]
  5. The polarity of induced emf is given by….[KEAM]

Questions on Electromagnetic Induction:

  1.  If a transformer of an audio amplifier has output impedance 8000 0 and the speaker has input impedance…...[JCECE 2005]
  2. A conducting loop in the shape of a right angled isosceles triangle of height 10cm10cm is kept such that the 90∘ vertex is…..[JEE Advance 2016]
  3. A 10m long horizontal wire extends from North East to South West. It is falling with a speed of 5.0ms−1……. [ JEE Main 2019]
  4. If a current of 2.0A2.0A flows through the smaller loop, then the flux linked with bigger loop is…… [JEE Main 2013]
  5. A coil of cross-sectional area A having n turns is placed in a uniform magnetic field B….. [JEE Main 21018]
  6. A copper rod of mass m slides under gravity on two smooth parallel rails, with separation ll and set at an angle of θ with the horizontal….. [JEE Main 2018]
  7. A copper wire is wound on a wooden frame, whose shape is that of an equilateral…. [JEE Main 2019]
  8. A metallic rod of length ll is tied to a string of length 2l and made to rotate with angular speed…. [JEE Main 2013]
  9. A square frame of side 10 cm and a long straight wire carrying current 1 A are in the plane of the paper…. [JEE Main 2014]
  10. If the rod makes n rotations per second, then the time averaged magnetic moment of the rod is… [JEE Main 2019]
  11. Figure shows a circular area of radius R where a uniform magnetic field….
  12. In a coil of resistance 100Ω , a current is induced by changing the magnetic flux through it….. [JEE Main 2017]
  13. When current in a coil changes from 5A  to 2A…. [JEE Main 2015]

Questions on Faradays laws of induction:

  1. Two identical circular coils A and B are kept on a horizontal tube side by side without touching each other…. [KCET 2013]
  2. The magnetic flux through a circuit of resistance RR changes by an amount….[NEET 2004]
  3. A conducting loop in the shape of a right angled isosceles triangle of height...[JEE Advance 2016]
  4. If a transformer of an audio amplifier has output impedance…..[JCECE]

Also Read:

Chapter 6 Related Articles
Faraday’s Laws of Induction Electromagnetic Waves Electromagnetic Spectrum
Electromagnetism Unit of Magnetic Flux Wave Nature of Electromagnetic Radiation
Magnetic Flux Lenz Law and Conservation of Energy Energy Consideration
Electromagnetic Radiations Electromagnetic Field Electromagnetic Pulse

Check-Out: 

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Class 12 PCMB Notes NCERT Class 12 Biology Book NCERT Class 12 Maths Book
NCERT Class 12 Textbooks NCERT Solutions for Class 11 Maths NCERT Solutions for Class 11 Physics
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NCERT Class 11 Chemistry Book NCERT Class 11 Physics Book NCERT Class 11 Biology Book
Class 11 Notes Important Maths Formulas Important Chemistry Formulas
Class 11 PCMB Syllabus Chemistry Study Notes Biology Study Notes
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CBSE CLASS XII Related Questions

  • 1.
    Two air-filled capacitors of capacitances $C_1$ and $C_2$ are connected in parallel with a dc battery. After the capacitors are fully charged, a slab of dielectric constant K is inserted between the plates of each capacitor. How will the (i) charge on each capacitor and (ii) energy stored in the capacitor affected after the slab is introduced.

        View Solution

      • 2.
        Capacitors are manufactured with certain standard capacitances and working voltages. However, these standard values may not be the ones that are actually needed in a particular application. Two or more capacitors can be grouped in series or in parallel to achieve desired capacitance and voltage. When connected in series, the total capacitance decreases while the voltage rating increases, whereas in parallel connections, the total capacitance increases and maintains the same voltage rating. A capacitor stores energy in the electric field between its plates and stored energy is proportional to the square of the voltage and capacitance $U = \frac{1}{2}CV^2$, where symbols have their usual meanings.
        Two capacitors, one of $3 \ \mu$F and the other of $6 \ \mu$F, are connected in series in the circuit as shown in the figure, for a long time. }

          • 3.
            A charged particle $+q$ in an electric field $\vec{E}$ experiences a force in the direction of the electric field. As a result, its kinetic energy changes. Similarly, the charged particle also experiences a force when it moves in a magnetic field $\vec{B}$. But this magnetic force is perpendicular to both velocity $\vec{v}$ of the charged particle and the magnetic field $\vec{B}$, so it cannot change the kinetic energy of the charged particle. Consider two charged particles 1 and 2 of masses $m$ and $\frac{m}{2}$ having charges $-q$ and $+2q$ respectively. They are accelerated from rest through the same potential difference $V$ and acquire kinetic energy $K_1$ and $K_2$. Then they enter in a region of uniform magnetic field $\vec{B}$ perpendicular to their velocities.

              • 4.
                Draw a labelled ray diagram of a refracting telescope when it forms image of a distant object at infinity. Derive expression for its magnifying power.

                    View Solution

                  • 5.
                    If T is the time period of the rotation of the coil, at what values of t in a cycle, the emf generator is maximum ?

                        View Solution

                      • 6.
                        An astronomical telescope consists of two converging lenses. One of them of large aperture and large focal length is called objective lens and the other one, of smaller focal length and smaller aperture is called the eyepiece. It is used to see distant objects which are not seen clearly with naked eyes. The image formed by the objective lens acts as an object for the eyepiece and the final image produced by the eyepiece is magnified.

                          View All

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