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3. Consider a positive charge in a region of uniform electric field. If the charge moves in the direction of the field, is the potential energy increasing or decreasing? Is the field doing positive or negative work on the charge? 4. Three identical positive point charges of charge +Q are initially at rest at infinite separation. What is the potential energy needed to bring the charges at the corners of an equilateral triangle of sice length a? 5. Two charges of equal charge magnitude are separated by a distance d. Which of the following pairs of charge signs will lead to a zero electric potential at d/2 relative to in finity? 1. Both are positive 11. Both are negative Ill. Opposite signs