## Tuesday, October 23, 2007

### Study guide H C Verma JEE Physics Ch. 38 ELECTROMAGNETIC INDUCTION

JEE SYLLABUS

Electromagnetic induction: Faraday's law, Lenz's law; Self and mutual inductance; RC, LR and LC circuits with d.c. and a.c. sources.
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Sections in the book

38.2 Lenz's law;
38.3 The origin of induced EMF
38.4 Eddy current
38.5 Self and mutual inductance;
38.6 RC, LR and LC circuits with d.c. and a.c. sources.
38.7 Energy stored in an inductor
38.8 mutual inductance;
38.9 Induction coil

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Study Plan

Ex. 38.1
38.2 Lenz's law;
38.3 The origin of induced EMF
Ex. 38.2
Worked out examples 1,2

Day 2
38.4 Eddy current
38.5 Self and mutual inductance;
Ex. 38.3,38.4
WOE 3,4

Day 3

38.6 RC, LR and LC circuits with d.c. and a.c. sources.
Ex. 38.5, 38.6
38.7 Energy stored in an inductor
Ex. 38.8
WOE 5,6

Day 4

38.8 mutual inductance;
Ex. 38.8
38.9 Induction coil
WOE 7 to 10

Day 5
WOE 11 to 20

Day 6
WOE 21 to 29

Day 7

Exercises 1 to 10

Day 8
Exercises 11 to 20

Day 9

Exercises 21 to 30

Day 10
Exercises 31 to 40

Day 11
Exercises 41 to 45

Day 12
Exercises 46 to 50

Day 13
Exercises 51 to 55

Day 14
Exercises 56 to 60

Day 15
Exercises 61 to 65

Day 16
Exercises 66 to 70

Day 17
Exercises 71 to 75

Day 18
Exercises 76 to 80

Day 19
Objective I

Day 20
Objective II
Questions for Short Answer 1 to 13

Special task Exercises 81 to 98

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For audiovisual lecture on this topic
http://www.curriki.org/nroc/Introductory_Physics_2/lesson41/Container.html

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JEE question 2007 Part I

A long, hollow conducting cylinder is kept coaxially inside another long, hollow conducting cylinder oflarger radius. Both the cylinders are initially electrically neutral.

(A) A potential difference appears between the two cylinders when a charge density is given to theinner cylinder
(B) A potential difference appears between the two cylinders when a charge density is given to theouter cylinder
(C) No potential difference appears between the two cylinders when a uniform line charge is keptalong the axis of the cylinders
(D) No potential difference appears between the two cylinders when same charge density is given toboth the cylinders

Sol: Ans [A]

Potential is constant inside cell due to charge on cell. To create potential difference charge must be given on inner cell.
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JEE 2007 Paper II
Statement - 1

A vertical iron rod has coil of wire wound over it at the bottom end. An alternating current flows in the coil. A conducting ring that can float on the rod is above the coil at a certain height above the coil.

Because

Statement - 2

In the above situation, a current is induced in the ring which interacts with the horizontal component of the magnetic field to produce an average force in the upward direction.

(A) Statement – 1 is True, Statement – 2 is True; Statement – 2 is a correct explanation for statement – 1
(B) Statement – 1 is True, Statement – 2 is True; Statement – 2 is Not a correct explanation for Statement – 1.
(C) Statement – 1 is True, Statement – 2 is False
(D) Statement – 1 is False, Statement – 2 is True

Solution; (A)

Both statements are correct

The magnetic field on the ring has two components. The horizontal component contributes to up upward vertical force to balance the weight of the ring and allows it to stay at that place.
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