Point charges +4.00 μC and +2.00 μC are placed at the opposite corners of a rectangle as shown in the figure. What is the potential at point A, relative to infinity, due to these charges? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2) 
Definitions:
Minimum Sample Size
The smallest number of observations or data points that is considered sufficient for a statistically valid result.
Population Proportion
The fraction or percentage of a population that exhibits a particular attribute or characteristic.
Confidence Interval
A stretch of numerical indicators, obtained from sample statistics, envisaged to hold the secret value of a population characteristic.
Margin of Error
An expression of the amount of random sampling error in a survey's results, indicating a confidence interval within which the true value lies.
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