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1. A foot-long piece of wire is charged with -1 microcoulomb of charge. What is its...

1. A foot-long piece of wire is charged with -1 microcoulomb of charge. What is its linear charge density in coulombs per meter? How strong is the electric field 20 feet away from the midpoint of the wire? How many Newtons of force will it exert on a H+ ion located at that point?

2-A six-inch metal disk is charge with +1 microcoulomb of charge. What is its area charge density in Coulombs per square meter? How strong is the electric field one foot above its center? How many Newtons of force will it exert on a H+ ion located at that point?

3-An ideal parallel-plate capacitor uses circular plates one centimeter in diameter and spaced 20 microns apart.   The top plate has a charge of 100 microcoulombs and the bottom plate is charged with -100 microcoulombs. What is the electric field at the center of the disks? What is the approximate electric field near the edge of the disks? What is the force exerted by one plate on the other

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