1. Fields and Waves Lesson 4.4 ELECTROMAGNETICS - Faraday’s Law
Darryl Michael/GE CRD

2. Faraday’s Law Faraday’s Law comes from Maxwell’s equation:
Note that in electrostatics, we used:
inductors
transformers
motors
generators
noise
Applications:
Do experiment 1, part 1

3. Faraday’s Law - concept of EMF
Since,
, the field is not conservative and we cannot use the concept of VOLTAGE
we can still use the term VOLTAGE but it would not have the same meaning
Setup for Problem 1:
is electromotive force
Use right hand rule for
and

4. Faraday’s Law Do problem 1b and 1c Low impedance Output
High impedance Output

5. Faraday’s Law Do problems 1d and 1e Finish Experiment 1
Do Experiment 2
Generator: Moving permanent magnet produces electrical power
Motor: Electrical power drives an electromagnet
different phase relationship between I and V

6. Faraday’s Law for moving loop
Previous example had:
In moving loop example:
,but
changes with time or
is a function of t

7. Faraday’s Law for moving loop
B-field into page
sliding bar
At time t1
sliding bar
At time t2 = t1 + Dt

8. Faraday’s Law for moving loop
Approximate numerator as:
Alternate expression