Class 12 CBSE Physics Electromagnetic Induction Board Questions
Here we provide Class 12 Physics important notes,board questions and predicted questions with Answers for chapter Electromagnetic Induction. These important notes,board questions and predicted questions are based on CBSE board curriculum and correspond to the most recent Class 12 Physics syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations as well as other entrance exams such as NEET and JEE.
class 12 CBSE Physics Electromagnetic Induction BoardQuestions
Electromagnetic Induction BoardQuestions
2017
Q1
Define mutual inductance between a pair of coils. Derive an expression for the mutual inductance
of two long coaxial solenoids of same length wound one over the other.
solutions
solutions
Q2
Define self-inductance of a coil. Obtain the expression for the energy stored in an inductor L
connected across a source of emf.
Solutions
Solutions
Q3
Draw a labelled diagram of an ac generator. Obtain the expression for the emf induced in the
rotating coil of N turns each of cross-sectional area A, in the presence of a magnetic field
B->.
Solutions
Solutions
Q4
4A horizontal conducting rod 10 m long extending from east to west is falling with a speed 5.0
ms-1 at right angles to the horizontal component of the Earth’s magnetic field, 0.3 x
10-4 Wb m-2.
Find the instantaneous value of the emf induced in the rod.
Solutions
Solutions
2018
Q1
State the principle of an ac generator explain its working with the help of a labelled diagram.
Optimization for the emf induced in coil having N turns each of cross sectional area A rotating with
the constant angular speed ‘ω’ in a magnetic field B-> directly perpendicular to the axis
of
rotation.
Solutions
Solutions
2019
Q1
Define mutual inductance and write its S.I. unit.
Solutions
Solutions
2020
Q1
The number of turns of a solenoid are doubled without changing its length and area of
cross-section. The self-inductance of the solenoid will become………………times.
Solutions
Solutions
Q2
A conducting rod PQ of length 20 cm and resistance 0.1 Ω rests on two smooth parallel rails of
negligible resistance AA’ and CC’. It can slide on the rails and the arrangement is positioned
between the poles of a permanent magnet producing uniform magnetic field B = 0.4 T. The rails; the
rod and the magnetic field are in three mutually perpendicular directions as shown in the figure. If
the ends A and C of the rails are short circuited, find the
(i) external force required to move the rod with uniform velocity v = 10 cm/s2, and
(ii) power required to do so.
Solutions
(i) external force required to move the rod with uniform velocity v = 10 cm/s2, and
(ii) power required to do so.
Solutions
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