Four point charges, each of the same magnitude, with varying signs are arranged at the corners of a square as shown.Which of the arrows labeled A, B, C, and D gives the correct direction of the net force that acts on the charge at the upper right corner? 
Definitions:
Opportunity Cost
The revenue that is foregone from an alternative use of an asset, such as cash.
Make-Or-Buy Options
The decision-making process where a company chooses between manufacturing a product in-house or purchasing it from an external supplier.
Differential Revenue
The difference in revenue generated under two different scenarios or choices.
Differential Revenue
The difference in revenue generated from two different business decisions, often used in managerial accounting to assess alternatives.
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