In Class 12 Boards there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 12 Physics Chapter 6 Electromagnetic Induction Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 12 Physics Case Study Questions Electromagnetic Induction to know their preparation level.
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In CBSE Class 12 Physics Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Electromagnetic Induction Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 12 Physics Chapter 6 Electromagnetic Induction
Case Study/Passage-Based Questions
Case Study 1: Currents can be induced not only in conducting coils but also in conducting sheets or blocks. Current is induced in solid metallic masses when the magnetic flux threading through them changes. Such currents flow in the form of irregularly shaped loops throughout the body of the metal. These currents look like eddies or whirlpools in water so they are known as eddy currents. Eddy currents have both undesirable effects and practically useful applications. For example, it causes unnecessary heating and wastage of power in electric motors, dynamos, and in the cores of transformers.
(I) The working of speedometers of trains is based on
| (a) wattless currents | (b) eddy currents |
| (c) alternating currents | (d) pulsating currents |
Answer: (b) eddy currents
(ii) Identify the wrong statement
| (a) Eddy currents are produced in a steady magnetic field |
| (b) Induction furnace uses eddy currents to produce heat. |
| (c) Eddy currents can be used to produce braking force in moving trains |
| (d) Power meters work on the principle of eddy currents. |
Answer: (a) Eddy currents are produced in a steady magnetic field
(iii) Which of the following is the best method to reduce eddy currents?
| (a) Laminating core | (b) Using thick wires |
| (c) By reducing hysteresis loss | (d) None of these |
Answer: (a) Laminating core
(iv) The direction of eddy currents is given by
| (a) Fleming’s left-hand rule | (b) Biot-Savart law |
| (c) Lenz’s law | (d) Ampere-circuital law |
Answer: (c) Lenz’s law
(v) Eddy currents can be used to heat localized tissues of the human body. This branch of medical therapy is called
| (a) Hyperthermia | (b) Diathermy |
| (c) Inductothermy | (d) none of these |
Answer: (c) Inductothermy
Case Study 2: Self Induction. When a current I flows through a coil, the flux linked with it is φ = LI, where L is a constant known as the self-inductance of the coil.
Any change in current sets up an induced emf in the coil. Thus, the self-inductance of a coil is the induced emf set up in it when the current passing through it changes at the unit rate. It is a measure of the opposition to the growth of the decay of current flowing through the coil. Also, the value of self-inductance depends on the number of turns in the solenoid, its area of cross-section, and the permeability of its core material.
(i) The inductance in a coil plays the same role as
(a) inertia in mechanics
(b) energy in mechanics
(c) momentum in mechanics
(d) force in mechanics
Answer: (a) inertia in mechanics
(ii) A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is
(a) 0.5 Wb
(b) 12.5 Wb
(c) zero
(d) 2 Wb
Answer: (b) 12.5 Wb
The inductance L of a solenoid depends upon its radius R as
(a) L ∝ R
(b) L ∝ 1/R
(c) L ∝ R2
(d) L ∝ R3
Answer: (c) L ∝ R2
(iv) The unit of self-inductance is
(a) Weber ampere
(b) Weber-1 ampere
(c) Ohm second
(d) Farad
Answer: (c) Ohm second
(v) The induced emf in a coil of 10 henry inductance in which current varies from 9 A to 4 A in 0.2
second is
(a) 200 V
(b) 250 V
(c) 300 V
(d) 350 V
Answer: (b) 250 V
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