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PHYSICS 112  REVIEW FOR EXAM 3
MAGNETIC FLUX:
The magnetic flux through a plane circuit is
cos , where
is the angle between
F)
)
œFE
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:
.
VM
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
IF
tt
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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This note was uploaded on 02/11/2012 for the course PHYSICS 112 taught by Professor Fretwell during the Summer '08 term at Iowa State.
 Summer '08
 Fretwell
 Current

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