A Certain Physics Textbook Shows a Region of Space in Which

question 30

Multiple Choice

A certain physics textbook shows a region of space in which two electric field lines cross each other.We conclude that:

• A)at least two point charges are present
• B)an electrical conductor is present
• C)an insulator is present
• D)the field points in two directions at the same place
• E)the author made a mistake

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Definitions:

Variable Costs

Costs that change in proportion to the level of output or activity, such as raw materials, labor, and utilities.

Output

The quantity of goods or services produced by a business, industry, or country.

Normal Profit

The payment made by a firm to obtain and retain entrepreneurial ability; the minimum income that entrepreneurial ability must receive to induce entrepreneurs to provide their entrepreneurial ability to a firm; the level of accounting profit at which a firm generates an economic profit of zero after paying for entrepreneurial ability.

Implicit Cost

The monetary income a firm sacrifices when it uses a resource it owns rather than supplying the resource in the market; equal to what the resource could have earned in the best-paying alternative employment; includes a normal profit.