A physicist is just an atom's way of looking at itself"
- Consider now a single
coil/circuit/loop with N turns. As the current in the loop
changes the magnetic field and hence the magnetic flux through
the loop changes. This changing "self flux" through
Faraday's Law leads to an induced emf in the circuit,
- In the same manner as mutual inductance we define the self
inductance of the circuit, L, as follows
so that the induced emf - sometimes called
a "back emf"
- is given by
This "back emf" always opposes the
primary emf (due to Lenz's Law), as shown in the
diagram at right.
which can be compared to the similar equation
- Calculating self inductance proceeds by the same steps
as mutual inductance - Calculate B, calculate
magnetic flux, then use the second equation above to
Renee Descartes walks into a bar, the bartender says 'sir
can I get you a martini 'Descartes says 'I don't think...'
and he disappears.
Dr. C. L. Davis
University of Louisville