Electromagnetic Induction
Faraday's and cenz's laws.
Definitions
Electromagnetic induction refers to the production of an induced
EMF magnetic force).
EMF can be thought of as a voltage or potential difference,
induced in a conductor as a result of the vel ative
motion of a magnet and a coil.
If a there is a closed circuit, an current induced current induced.
will
be
Motion of conductor/charges
Force on moving charges
creation of a potential
seperation of
(F=quB)
causes a current in an enclosed charges. circuit.
difference
Farady's law
Michael Favaday performed a sevies of experiments that
showed an EMF is induced in a circuit when it
experiences a change in magnetic flux.
Magnetic flux: A measure of the total number of
magnetic field lines that pass through a chosen
surface area.
10=B,A =
Faraday's Law can be stated as follows:
An EMF is induced whenever a circuit experiences a
change of magnetic flux and the EMF induced in a
circuit is directly proportional to the rate of change
of magnetic flux through the circuit.
E
11
10
-
A(B,,A)
At
At
induced EMF
- The magnitude of B varies with time
- - The area of the circuit can change with time.
The angle between B and the normal to the plane
changes with time.
