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Q1 A rectangular wire loop of sides 8 cm and 2 cm with a small cut is moving out of a region of uniform magnetic field of magnitude 0.3 T directed normal to the loop. What is the emf developed across the cut if the velocity of the loop is 1 cm s−1 in a direction normal to the
(a) longer side,
(b) shorter side of the loop? For how long does the induced voltage last in each case?Ans: Length of the rectangular wire, l = 8 cm = 0.08 m
Width of the rectangular wire, b = 2 cm = 0.02 m
Hence, area of the rectangular loop,
A = lb
= 0.08 × 0.02
= 16 × 10−4 m2
Magnetic field strength, B = 0.3 T
Velocity of the loop, v = 1 cm/s = 0.01 m/s
(a) Emf developed in the loop is given as:
e = Blv
= 0.3 × 0.08 × 0.01 = 2.4 × 10−4 V
Time taken to travel along the width , t = Distance traveled / Velocity = b / v
= 0.02 / 0.01 = 2 sHence, the induced voltage is 2.4 × 10−4 V which lasts for 2 s.
(b) Emf developed, e = Bbv
= 0.3 × 0.02 × 0.01 = 0.6 × 10−4 V
Time taken to travel along the length, t = Distance traveled / Velocity = l / v= 0.08 / 0.01 = 8 sHence, the induced voltage is 0.6 × 10−4 V which lasts for 8 s.
Electromagnetic Induction Question Answers: NCERT Class 12 Physics
Welcome to the Chapter 6 - Electromagnetic Induction, Class 12 Physics - NCERT Solutions page. Here, we provide detailed question answers for Chapter 6 - Electromagnetic Induction.The page is designed to help students gain a thorough understanding of the concepts related to natural resources, their classification, and sustainable development.
Our solutions explain each answer in a simple and comprehensive way, making it easier for students to grasp key topics and excel in their exams. By going through these Electromagnetic Induction question answers, you can strengthen your foundation and improve your performance in Class 12 Physics. Whether you're revising or preparing for tests, this chapter-wise guide will serve as an invaluable resource.
In the sixth chapter of Physics NCERT Class 12, you get to learn about electromagnetic induction. This chapter contains a bit of the previous chapter’s information about magnetism and matter too. The chapter comprises ten topics in total, and teach you about the concept of magnetic induction, magnetic flux, inductance, eddy currents and a lot more. You will also get to learn about Faraday’s Law of electromagnetic induction, Fleming’s Right Hand Rule, and Lenz’s Law in this chapter.
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Exercise 1
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