Physics 1029A/B Lecture 14: Feb 12
5 Mar 2018
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There are positive and negative charges. ounequal charges attract each other. Arrows will point towards each other in the diagram. oequal charges repel each other. Arrows will point away from each other in the diagram. ocoulomb law: similar to gravitational law. You multiply both the charges and divide by the distance between them squared. (see formula on slide) The k constant is different that g, and we have charges not masses. The vector directions are what you need to figure out. This gets you the magnitude, so it will always be positive. If you have two positives, they are repulsive. Superposition: we sum up the entities we have. The charge on sphere 1 is 4 uc. So b is an option, d is an option and e is an option. But d and e are a little weird because they aren"t semetrical, so the answer is b. We end up with a force of 4. 57 x.
