Four Point Charges of Equal Magnitude but with Varying Signs

question 8

Multiple Choice

Four point charges of equal magnitude but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure.Which one of the arrows shown represents the net force acting on the center charge?

• A)A
• B)B
• C)C

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Definitions:

Opportunity For Selection

Refers to the variance in fitness within a population. When there is no variance in fitness, there can be no selection; when there is large variance in fitness, there is a great opportunity for selection. In this sense, the opportunity for selection constrains the intensity of selection that is possible.

Male Signal

A form of communication used by male animals to attract females, assert dominance, or deter rivals, often involving visual displays, sounds, or chemical signals.

Sensory Bias

A concept in evolutionary psychology and ethology suggesting that preference for certain traits evolves because it exploits pre-existing preferences within the sensory system of an organism.

Condition-Dependent

Relating to traits or behaviors that vary according to an individual's environment or physical condition.