Class 12 Physics UNIT 4 Electromagnetic Induction And Alternating Current

Road side Transformer

Class 12 Physics UNIT 4

Introduction

Magnetic flux

Example 4.1

Example 4.2

Faraday’s Experiments on Electromagnetic Induction

Faraday’s Law of Electromagnetic  Induction

Example 4.3

Example 4.4

Example 4.5

Lenz’s law

Fleming’s right hand rule

Example 4.6

Example 4.7

Motional emf from Lorentz force

Motional emf from Faraday’s law and Energy conservation

Example 4.8

Example 4.9

Eddy currents

Drawbacks of Eddy currents

Application of eddy currents

Self-induction

Self-inductance of a long solenoid

Example 4.10

Example 4.11

Mutual induction

Mutual inductance between two long co-axial solenoids

Example 4.12

Example 4.13

Methods of producing induced emf Production of induced emf by changing the magnetic field Production of induced emf by changing the area of the coil

Example 4.14

Production of induced emf by changing relative orientation of the coil with the magnetic field

Example 4.15

AC generator Advantages of stationary armature-rotating field alternator

Single phase AC generator

Three-phase AC generator ,Advantages of three phase alternator

Transformer Construction and working of transformer

Energy losses in a transformer

Advantages of AC in long distance power transmission

Example 4.16

Example 4.17

Alternating current

Mean or Average value of AC

RMS value of AC

Example 4.18

Example 4.19

Phasor and phasor diagram

AC circuit containing pure resistor

AC circuit containing only an inductor

AC circuit containing only a capacitor

Example 4.20

Example 4.21

AC circuit containing a resistor, an inductor and a capacitor in series – Series RLC circuit

Resonance in series RLC Circuit

Quality factor or Q–factor

Example 4.22

Example 4.23

Example 4.24

Example 4.25 Introduction of power in AC circuits

Wattless current

Power factor

Advantages and disadvantages of AC over DC

Example 4.26

Example 4.27

Energy conversion during LC oscillations

Conservation of energy in LC oscillations

Analogies between LC oscillations and simple harmonic oscillations