Figure 24-28 shows a system of three charged particles. If you move the particle of charge +q from point A to point D, are the following positive, negative, or zero: (a) the change in the electric potential energy of the three-particle system, (b) the work done by the net electrostatic force on the particle you moved, and (c) the work done by your force? (d) What are the answers to (a) through (c) if, instead, the particle is moved from B to C?
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