Lenz' Law and Generators

This lecture is based on HRW, Sections 31.4 to 31.6.

When the relative motion of a conducting loop and a magnetic field generates a changing magnetic flux through the loop, it creates a motional EMF in the loop.
One can use the Earth's magnetic field as a source of energy, if one can move a loop through it (example: loop of wire on a satellite orbiting the Earth).
Lenz' Law describes the direction in which current flows when driven by a changing magnetic flux through a loop: it flows in the direction which will create an induced magnetic flux which opposes the change in the original flux.

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