These effects are derived from two fundamental observations of physics: a steady current creates a steady magnetic field described by Oersted's law, and a time-varying magnetic field induces an electromotive force in nearby conductors, which is described by Faraday's law of induction.
Butter & salt. Preheat the oven to 400 degrees. Husk the corn, wrap each ear in foil, adding 2 teaspoons of butter to each packet. Bake for about 25 minutes or roast the foil-wrapped corn over hot coals turning once during the cooking. Serve with more butter and salt.
The best way to cook corn on the cob is so simple. Wash the corn, with the husk still on. For two ears, place on a plate, in the microwave. Cook at high for 6 minutes. Remove the husk. If the corn is fresh and locally grown you do not need butter or salt.