G H RAISONI UNIVERSITY

BRANCH : B. TECH (C.S.E.)

NAME : PUJA PURUSHOTTAM KALASKAR

SUB. - ELECTRICAL AND ELECTRONICS

TOPIC OF PRESENTATION

FARADAY`S LAW OF INDUCTION

ROLL NO. 25

FIRADAY’S LAW OF ELECTROMAGNETIC INDUCTION

FIRST LAW Whenever the amount of magnetic flux linked with a closed circuit changes , An emf is induced in the circuit . The induced emf lasts so long as the change in magnetic flux continues .

Second lawThe magnitude of emf induced in a closed circuit is directly proportional to the rate of change of magnetic flux linked with thecircuit.

Let 1 be the magnetic flux linked with the coil initially and φ2 be the magnetic flux linked with the coil after a time t. Then Rate of change of magnetic flux = 2 1φ −φAccording to Faraday’s second law, the magnitude of inducedemf is, e α 2 1tφ −φ.If dφ is the change in magnetic flux in a time dt, then the above equation can be written as e α

PRINCIPLE OF FARADAY’S LAWFaraday’s law of induction is a basic

law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force (emf) a phenomenon called electromagnetic induction . It is the fundamental operating principal of transformers , inductor , and many type of electrical motors, generators and solenoids.

SIMULATION

CHEAP

RELIABLE

controllable

efficient

Clean

&green

ADVANTAGES OF FARADAY’S LAW

DISADVANTAGES OF FARADAY’S LAW

Coal and oil • dirty• Non

renewable

Nuclear fusion • expensive• radioactive

geothermal• Clean • renewable

APPLICATION OF FARADAY’S LAW

Transformer •They are useful to transmit A.C. electricity without much loss of power.

Induction cooker • Coil of copper wire paced below a cooking container .

Musical instruments •Musical instruments like guitar etc.•It have a pick up device attached to them which follows the faraday’s law of induction.

NUMERICAL PROBLEMS

A coil is wrapped with 200 turns of wire on the perimeter of a square frame of sides 18 cm. the total resistance of the coil is 2.0 ohms. A uniform magnetic field is turned on perpendicular to he plane of the coil.a) If the field changes linearly from 0 to 0.05

Wb/m2 in a time of 0.08s, find the magnitude of the induced in the coil while the field is changing.

b) What is magnitude of the current induced in the coil while the field is changing.

a.

A=0.0342m2,emf=4.1v b. 2.05A