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.
1 Place ear of corn in a microwave oven and cook on high for 2 minutes; flip corn over and cook on high until kernels are hot and steaming, another 2 minutes.  Place corn ear on a cutting board, using a pot holder or folded kitchen towel, and cut off the bottom of the ear, exposing 1/4 to 1/2 inch of kernels. Hold the ear from the top and squeeze ear of corn out of the husk from top to bottom. Husks and silk will be left behind.