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CBSE 12th Standard Physics Subject Electromagnetic Induction HOT Questions 1 Mark Questions 2021

Published on: 27/05/2021

QB365 Provides the HOT Question Papers for Class 12 Physics, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

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Std: 12th Standard CBSE - Physics

chapter: - HOT Questions

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Questions:

Generic 2

5 x 2 = 10

Define self-inductance in terms of work done against the induced emf.

How is the mutual inductance of a pair of coils affected when separation between the coils is increased? The number of turns of each coil is increased? A thin iron sheet is placed between the two coils, other factors remaining the same? Explain your answer in each case.

A cylindrical bar magnet is kept along the axis of a circular coil, when the magnet is rotated (a) about its own axis, and (b) about an axis perpendicular to the length of the magnet, in which case the induced emf will be more?

Give the direction in which the induced current flows in the coil mounted on an insulating stand when a bar magnet is quickly moved along the axis of the coil from one side to the other as shown.

A transformer has 150 turns in its primary and 1000 in secondary. If the primary is connected to 440 V DC supply, what will be the induced voltage in the secondary side?

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Answers Key:

Generic 2

5 x 2 = 10

Self - inductance is defined as double the work done against the induced emf in producing unit current in the coil itself \(L=\frac{2 W}{I^2}\)

(i) Mutual inductance decreases.
(ii) Mutual inductance increases.
(iii) Concept:
(i) If distance between two coils is increased as shown in figure. It causes decrease in magnetic flux linked with the coil C2. Hence induced emf in coil C2 decreases by relation Hence mutual inductance decreases.
(ii) From relation M21 = µ0 n1 n2 Al, if number of turns in one of the coils or both increases, means mutual inductance will increase.

In Case of (b) it is more

Anticlockwise

Zero, as transformer works only in AC and in case of DC supply, there is no induced emf in secondary because there is no induced emf in secondary because there is no change in flux through the transformer circuit.