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Unformatted text preview: 44. Electric forces are not important in determining the motions in the solar system because of cancellation. Each of the bodies in the solar system has very nearly equal numbers of positive and negative charges. The attraction between the positive charges in one body for the negative charges in the other body is cancelled by the repulsion of the positive charge in the first body for the positive charges in the second, and so on. Because there is no cancellation with gravitational forces, they dominate at this scale. Exercise 8. The electric field is equal to the force a unit positive charge would experience at that place. We can get its value by dividing the force on a charged object by the charge on the object. The field doesnt change if the object is removed. 3 3 75 N 5 10 N/C 15 10 C F E q-= = = - - The minus sign indicates that the field points in the direction opposite to the force; that is, east....
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- Fall '02