Physics 201- Introduction to Electricity & Magnetism
|November 25- Induced electric fields|
We must calculate the magnetic flux, just as we did
the electric flux, by integrating the field over some surface.
Unlike the electric flux in Gauss' Law, here we are concerned with an open,
rather than closed surface.
The unit of magnetic flux is a weber: 1 Wb= 1 Tm2
Find the magnetic flux through a solenoid that is
40cm long, has a radius of 2.5cm, has 600 turns, and carries a current
Notice that in Faraday's Law, what is important is
the change in the flux, not simply the flux.
Given some change in magnetic flux, there will be
an induced electric field and emf. (If that electric field lies within
a conductive wire, there will also be an induced current.)
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