Two electric charges each equal to -Q are separated by adistance d. If you make

Question

Two electric charges each equal to -Q are separated by adistance d. If you make a graph of the electric potential asa function of the distance along the line connecting the twocharges, the point exactly midway between the two chargeswould... A) oscillate between being a relative maximum and a relativeminimum B) be neither a relative maximum nor a relative minimum C) be a relative maximum D) be a relative minimum WHY? Two electric charges each equal to -Q are separated by adistance d. If you make a graph of the electric potential asa function of the distance along the line connecting the twocharges, the point exactly midway between the two chargeswould... A) oscillate between being a relative maximum and a relativeminimum B) be neither a relative maximum nor a relative minimum C) be a relative maximum D) be a relative minimum WHY?

Explanation / Answer

Here the two charges are -Q and -Q respectively. Distance between the two charges is d Then potential due to -Q at the midpoint between thecharges is k(-Q)/d/2 = -2kQ/d Now the total potential is V = -4kQ/d If you take point other than midpoint then potential be willless than this value . Thus the potential at the midpoint be a relative maximum.

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