What is the electric potential at a point 5.0m away from a 4.0 mu C point charge

Question

What is the electric potential at a point 5.0m away from a 4.0 mu C point charge, assuming the potential is zero at infinity? How much work is required to bring a 6.0 mu C point charge from infinity to this point? The next three problems refer to two point charges on the x-y plane where coordinates are measured in meters. A 4.0 mu C point charge lies at the origin and a -3.0 mu C point charge lies at the point (2, 0). Find the electric potential at the points (3, 0), (1, 0) and (-1, 0). Find the x-coordinate of the point where the potential vanishes. Find the potential at the point (0, 3).Given a set A of n activities a_i = [s_i, f_i], i = 1, 2, ..., n, where s_i is the start time and f_i is the finish time for i-th activity, the problem is to schedule the maximum number of activities for two classrooms. The activities scheduled for the same classroom must be non-conflicting. Consider the following algorithm: assign as many activities as possible to the first classroom, then assign as many activities as possible to the second classroom (not using the activities already assigned to the first classroom). Does it always solve the problem? Justify your answer (prove or disprove).

Explanation / Answer

q = 4 uC, r = 5 m

electric potential V = kq/r

V = 9*10^9*4*10^-6/5

V = 7200 V

W = QV

W = 6*10^-6*7200

W = 0.0432 J

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