PHYSICS 112  REVIEW FOR EXAM 3
MAGNETIC FLUX:
The magnetic flux through a plane circuit is
cos , where
is the angle between
F
)
)
œ FE
F
t
and the normal (
perpendicular) to the plane of the circuit.
Units: Tm
.
´
2
MAGNETIC INDUCTION
The current induced in plane loop is proportional to the rate of change of the magnetic flux through the
loop.
If the loop has electrical resistance
, the current is given by Faraday's law:
.
V
M œ
?F ?
Î
>
V
LENZ' LAW
The direction of the induced current in a loop is such as to oppose the change in flux that produced it.
Thus if the flux is increasing/decreasing in magnitude, the induced current must produce a magnetic field in the
opposite/same direction as the external magnetic field.
ELECTROMAGNETIC WAVES
A plane electromagnetic waves has electric field
and magnetic field
that are perpendicular to each
I
F
t
t
other and always in phase (zero at same time, maxima and minima at the same time) and always both perpendicular
to the direction of propagation
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 Summer '08
 Fretwell
 Current, Magnetic Field

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