A Point Charge Q Is Placed on the X Axis

question 16

Multiple Choice

A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, −Q, is placed at x = 3.0 m. If Q = 40 μC, what is the magnitude of the electrostatic force on a 30-μC charge placed at the origin?

• A) 7.2 N
• B) 3.9 N
• C) 1.5 N
• D) 14 N
• E) 8.1 N

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Definitions:

Long-Run Average Total Cost Curve

A graphical representation illustrating the per unit cost of producing a good or service in the long run, when all inputs are variable.

Fixed Cost

Expenses that do not change with the level of output or sales in the short term, such as rent, salaries, and insurance.

Output

The total amount of goods or services produced by a company, industry, or economy over a certain period.

Constant Returns To Scale

Long-run average total cost is constant as output increases.