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## Main Question or Discussion Point

To my understanding electric potential is the measure of energy per charge.

Now what I don't understand is that the voltage at the point P will be the same if there is a positive charge Q at A and a positive charge Q at B, or if there is a positive charge 2Q at A. I don't get how a test charge at point P should have the same amount of energy in both cases. Help.

Now what I don't understand is that the voltage at the point P will be the same if there is a positive charge Q at A and a positive charge Q at B, or if there is a positive charge 2Q at A. I don't get how a test charge at point P should have the same amount of energy in both cases. Help.