emft

2. INTRODUCTION TO ELECTROMEGNETIC THEORY
Electromagnetics is the study of field interaction which is generated by charge
distributions and current.
INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
field

3. Need of EMFT to analyse Electrical circuits
Consider the circuit given below there are various possible outcomes:
• Nothing will happen as circuit is open so the current is zero
• Short time current flow
• Length and shape of wire is not given
• frequency of source is not given
t = 0 INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
Vs
t=0

4. Short time current flow
• As the battery is the source of ions that’s why when the electrodes are
connected which are made from metals there must be some charging which
charge the wire. So due to charging process there should be a current for a short
time.
 But to know the charging process, shape of output waveform and effect of
frequency it is necessary to know the length and frequency of source.
INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha
1. Charging process
2. Shape of current
waveform

5. Shape of wire
If the wire is not straight means it has some turns then outwill change
• CKT1
Wire is bend (whatever be the shape of bend) before connecting the resistor.
• If the wire is replaced by two metal plates then it act like capacitor
• CKT2
• capacitor alters the voltage across the resistor.
• Now again there are various questions like what is the capacitance? How do we
calculate it?
INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

6. Length of wire
INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

7. Wire as a transmission line
• When phase shift between two points of a wire is significant fraction
of 360 degrees, treat wire as transmission line.
DIAGRAM?
INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

8. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

9. How to calculate T-line parameters?
• Volatage is defined in terms of electric field and the current in terms
of magnetic field.
• When T- line is excited by voltage/current, E and H fields are
generated
• Knowledge of these fields are necessary to calculate the T- line
parameters. Using EM theory we can calculate these fields
INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

10. Application of EMT
• Optics:
• optoelectronics -waveguide, modulators, couplers integrated
optical components, fiber etc
• fiber optics- laser, detectors etc
• optical communications- fiber propagation , non-linear optics etc.
• communication:
• channel: air, copper, fibers
• KVL, KCL, OHMS LAW
• RF AND MICROWAVES
INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

11. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
Keep Watching
& Supporting us
@LocusPointofYourCareer
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

12. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

13. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

14. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

15. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

16. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

17. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

18. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

19. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

20. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha

21. INTRODUCTION TO ELECTROMEGNETIC THEORY
EMFT (Electro-Magnetic Field Theory) By: Sandhya Sinha
EMFT (Electro-Magnetic Field Theory)
By: Sandhya Sinha