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.
Rinse entire ear of corn under water briefly. Wrap corn in a paper towel and place on a microwave-safe plate. Cook corn in the microwave oven until hot and cooked through, 3 to 5 minutes. Remove from microwave and let rest for 2 minutes. Remove corn husk.