Class 12 Physics
Electromagnetic Induction
Question 1:
The phenomenon called electromagnetic induction was first investigated by
Question 2:
The basic requirement for inducing e.m.f in a coil is that
Question 3:
A circuit has inductance of 2H. If the circuit current changes at the rate of 10 A/ second, then self-induced e.m.f. is ………..
(a) 5V
(b) 0.2 V
(c) 20 V
(d) 10 V
Question 4:
Two identical loops, one of copper and another of constantan are removed from a magnetic field within the same time interval. In which loop will be induced current be greater?
Question 5:
Define one Henry.
Question 6:
The induced emf is sometimes known as ‘Back emf’ why?
Question 7:
How is the mutual inductance of a pair of coil affected when:
Explain your answer in each case.
Question 8:
Two coils have mutual inductance of 1.5 henry. If current in primary circuit is raised to 5 amperes in one ms after closing the circuit. What is the emf induced in the secondary?
Question 9:
A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth’s magnetic field HE at a place. If HE= 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel? Note that 1 G = 10–4 T.
Question 10:
A circular coil of radius 10 cm, 500 turns and resistance 2 Ω is placed with its plane perpendicular to the horizontal component of the earth’s magnetic field. It is rotated about its vertical diameter through 180° in 0.25 s. Estimate the magnitudes of the emf and current induced in the coil. Horizontal component of the earth’s magnetic field at the place is 3.0 × 10–5 T.
Question 11:
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?
Question 12:
A coil of inductance 0.25 H is connected to 18 V battery. Calculate the rate of growth of current?
Question 13:
Self-induction of an air core inductor increases from 0.01 mH to 10 mH on introducing an iron core into it. What is the relative permeability of the core used?
Question 14:
State Lenz’s law. A metallic rod held horizontally along east-west direction, is allowed to fall under gravity. Will there be an emf induced at its ends?
Question 15:
Two concentric circular coils, one of small radius r1 and the other of large radius r2, such that r1<< r2, are placed co-axially with centres coinciding. Obtain the mutual inductance of the arrangement.
Question 16:
The motion of copper plate is damped when it is allowed to oscillate between the pole pieces of a magnet. State the cause of this damping.
Question 17:
Obtain the expression for the magnetic energy stored in a solenoid in terms of magnetic field B, area A and length l of the solenoid.
Question 18:
State Faraday’s Law of electromagnetic induction
Smita peddles a stationary bicycle. The pedals of the bicycle are attached to a 100 turn coil of area 0.10 m2. The coil rotates at half a revolution per second and it is placed in a uniform magnetic field of 0.01 T perpendicular to the axis of rotation of the coil. What is the maximum voltage generated in the coil?
Question 20:
An electromagnet has stored 648 J of magnetic energy, when a current of 9 A exists in its coils. What average emf is induced if the current is reduced to 0 in 0.45 s?
**********
In summary, problem-solving after learning a theoretical concept on CBSE Electromagnetic Induction Class 12 Physics is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.
You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.
Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.
All About Daily Practice Problems on Class 12 Physics Electromagnetic Induction NCERT Chapter 6
Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 12 Physics Electromagnetic Induction NCERT Chapter 6 useful.
Last but not least, to get the best hold on Class 12 Physics Electromagnetic Induction NCERT Chapter 6, do not forget to check out: