faraday's law of induction

first and second law with numerical

1. 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

2. 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 .

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

4. 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 1 φ −φ According to Faraday’s second law, the magnitude of induced emf is, e α 2 1 t φ −φ .If dφ is the change in magnetic flux in a time dt , then the above equation can be written as e α

5. PRINCIPLE OF FARADAY’S LAW Faraday’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 .

6. SIMULATION

7. ADVANTAGES OF FARADAY’S LAW

8. DISADVANTAGES OF FARADAY’S LAW

9. APPLICATION OF FARADAY’S LAW

10. 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. 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. 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