1. Vectors A = (3m, 1m) and B = (-2m, 2m). What is the cross product A x B ?
Answer: 8m in the +z direction or 8m k (where "k" is the k-hat unit vector) or (0m, 0m, 8m)
2. Joe stands 1m from a a charge of +Q Coulombs. Which decreases the electric force on Joe by a larger amount?
Answer: increasing the distance from the charge to 2m; the force between Joe and charge drops to 1/4 of its original value.
Answer: some good choices are conductors: gold, silver, iron, aluminum, copper insulators: rubber, glass, paper, cloth, wood semiconductors: silicon, germanium, gallium arsenide
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