Acoil lies flat on a table top in a region where the magnetic field vector points straight up. the20)_ magnetic field vanishes suddenly. when viewed from above, what is the sense of the induced current in this coil as the field fades? a) the induced current flows clockwise. b) the induced current flows counterclockwise. c) the current flows counterclockwise initially, and then it flows clockwise before stopping. d) the current flows clockwise initially, and then it flows counterclockwise before stopping e) there is no induced current in this coil.

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

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What does si stand for,when referring to a system of measurement