lecture note excerpt - typed - Chap 13 Q28

# lecture note excerpt - typed - Chap 13 Q28 - ex Q28 Chap 13...

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ex Q28 Chap 13 Q. Does the electric potential decrease or increase as we move toward a negative charge? A. Decrease. Before we do our solution, let's recall four ideas: First, recall that the potential energy PE decreases when an object moves in the direction that it wants to move , i.e., when the object moves in the direction of the applied force. (Reminder about the meaning of 'decrease': if the PE decreases, the two cases are: if the PE is already positive it will become less positive, and if the PE is already negative it will become more negative). Second, recall that opposite charges attract . That means that the force acting on one charge is always toward the other charge, if the two charges are opposite. Third, recall that when a test charge q is moved to a different position , where the electric potential V is different, the potential energy of that test charge will change according to PE = q V . Fourth: recall that

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## lecture note excerpt - typed - Chap 13 Q28 - ex Q28 Chap 13...

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