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CE-03-SS2005

# CE-03-SS2005 - CLASS EXERCISE#3 15 June 2005 Consider the...

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CLASS EXERCISE #3 - 15 June 2005 Consider the electrical force between pairs of electric charges as shown. These are three independent problems, with different charges but the same separation in each case. represents the same number of coulombs in each <U case. Let denote the force / Show the magnitude (in terms of ; J5 U < Þ J 22 e.g., 2 or 3 ) and direction of the force on each charge in each pair. J 1. U Š oqqqqqqqqqqqp ‹  U < Solution: UŠpJ J o‹ U 2. 2 U Š oqqqqqqqqqqqp Š U < Solution: 2 2 2 JoqŠ U UŠqp J 3. 2 2 U Š oqqqqqqqqqqqp ‹  U < Solution: 2 4 4 2 U Š qqqp J J oqqq ‹  U The electrical forces are attractive (towards the other charge) in cases (1) and
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