1
Reminders and Announcements
•
Homework 14 is due tomorrow; HW 15 is
due Friday
•
Exam 2 is next Monday
•
Help Room
Hours (Physics 117):
–
M 48 pm, T 36:30, W 36:30, R 4:308, F 26
Chapter 31
Faraday’s Law
Michael Faraday
•
Great experimental
physicist
•
1791
–
1867
•
Contributions to early
electricity include:
–
Invention of motor,
generator, and
transformer
–
Electromagnetic
induction
–
Laws of electrolysis
Induction
•
An
induced current
is produced by a
changing magnetic field
•
There is an
induced emf
associated with the
induced current
•
A current can be produced without a battery
present in the circuit
•
Faraday’s law of induction describes the
induced emf
Faraday’s Law –
Statements
•
Faraday’s law of induction states that “the
emf induced in a circuit is directly
proportional to the time rate of change of
the magnetic flux through the circuit”
•
Mathematically,
B
d
ε
dt
Faraday’s Law –
Statements, cont
•
Remember
B
is the magnetic flux through
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 Spring '09
 Work, Magnetic Field, Michael Faraday

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