Friday, March 20, 2015

EM Induction Videos

Here are links to the videos relevant to EM Induction.

Here is a magnetic flux example, where a circuit is next to a long wire.

The simplest case of induction is just a conducting bar moving through a B-field. The B-field will polarize the rod, due to F = qv x B. To spice it up, you can rotate the bar in a B-field.

For Faraday's law of induction, the version emf = -B dA/dt.
For Faraday's law of induction, the version emf = -A dB/dt. Also with this version of Faraday's law is how to find the circulating electric fields that are induced when we have dB/dt.

Here's an example of a circuit falling through a B-field, and the magnetic braking force can lead to a terminal speed.

When we put solenoids in circuits, they are called inductors. Here's a series LR circuit.
Here is a LR circuit with the inductor and resistor in parallel with each other.

The last circuit we do is an LC circuit (inductor and capacitor in series with each other).

Finally, here is one about Maxwell's displacement current, which he needed to explain how capacitors really work and to complete Ampere's law.