A Charge of +80 μC Is Placed on the X

question 15

Multiple Choice

A charge of +80 μC is placed on the x axis at x = 0. A second charge of −50 μC is placed on the x axis at x = 50 cm. What is the magnitude of the electrostatic force on a third charge of 4.0 μC placed on the x axis at x = 30 cm?

• A) 13 N
• B) 77 N
• C) 39 N
• D) 25 N
• E) 45 N

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Definitions:

Countershading

A coloration pattern in animals where the upper side is darker than the lower side, reducing visibility by counteracting the effects of light and shadow.

Predators

Organisms that hunt, kill, and consume other organisms for food.

Obscure

To make something difficult to see or to make unclear, either literally by blocking light or figuratively by being difficult to understand.

Chordates

A large phylum of animals that includes all vertebrates as well as two groups of invertebrates, characterized by having a notochord at some stage of their development.