ELECTROMAGNETIC INDUCTION


EMF = - N Δ(ABcosθ)/(Δ t).

Lenz's Law!

A generator is like a motor run backward. British Prime Minister Sir Robert Peel (1788-1850), after seeing a demonstration of the dynamo effect, asked Faraday of what use the discovery was. Faraday replied, “I know not, but I will wager that one day your government will tax it.”

• MUTUAL INDUCTION: Changing magnetic field due to a coil 1 induces a changing current in nearby coil 2.
• SELF INDUCTION: Changing magnetic field in a coil due to a changing current induces a new current in the coil that opposes the original current.

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