CLASS EXERCISE #3 - 15 June 2005Consider the electrical force between pairs of electric charges as shown.These are three independent problems, with different charges but the sameseparation in each case. represents the same number of coulombs in each<Ucase. Let denote the force /Show the magnitude (in terms of ;J5U<ÞJ22e.g., 2 or 3) and direction of the force on each charge in each pair.JÎJ1. U Š oqqqqqqqqqqqp ‹ U<Solution: UŠpJJ o‹ U2. 2U Š oqqqqqqqqqqqp Š U<Solution: 222JoqŠ UUŠqp J3. 22U Š oqqqqqqqqqqqp ‹ U<Solution: 2442U Š qqqp JJ oqqq ‹ UThe electrical forces are attractive (towards the other charge) in cases (1) and
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