• The result should look like that plot shown below. Save and print this graph.
• The position along the z axis, the height, represents the size of the electric potential at the point r=(x,y).
• If a positively charged test particle were introduced into this system, it would behave somewhat like a particle placed on a mountain shaped like the figure below. It would slide down the mountain, its acceleration related to the steepness of the slope.

Note that the volcano-like shape is cut off at ten not because that is what the electric potential is really like but because that's where we told Excel to stop drawing it.

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