Faraday's Experiment
Faraday's experiment showing induction between coils of wire: The liquid battery (right) provides a current which flows through the small coil (A), creating a magnetic field. When the coils are stationary, no current is induced. But when the small coil is moved in or out of the large coil (B), the magnetic flux through the large coil changes, inducing a current which is detected by the galvanometer (G).
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"Faraday's law of induction."
http://en.wikipedia.org/wiki/Faraday's_law_of_induction
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