w13_solution

# A the pairs are close the pairs are far total energy

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Unformatted text preview: gy will be negative. A) B) C) D) E) (a), then (b) and (c) tie (b), (a), (c) (a), (c), (b) (b) and (c) tie, then (a) (c), (a), (b) (b) Two of the positive pairs are L apart and the other is 2L apart. The +/- pairs are L, 2L, and 3L apart. That means that total energy will be positive. (c) for both the +/+ and the +/- pairs there are two 2L apart and one sqrt(2)*2L apart. These cancel and leave zero total energy. 17. A dipole of magnitude 0.1 C-m is held at rest so that it makes an angle of 135º with a uniform electric field of magnitude 400 N/C. After the dipole is released what is the maximum kinetic energy that it will attain during its ensuing motion? A) 43.2 J B) 53.6 J C) 68.3 J D) 26.7 J E) 35.9 J Version 1 Page 11 18. The diagram depicts a very large insulating slab of uniform charge density ρ and thickness of 2a. There is a spherical region within the slab from which all charge has been removed. What is the direction of the electric field at point P within the spherical region? (Note that point P is not at the center of the spherical region)....
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