Three Coplanar Parallel Straight Wires Carry Equal Currents I to the Right

question 19

Multiple Choice

Three coplanar parallel straight wires carry equal currents I to the right as shown below.The current in the upper two wires is directed to the right,but the current in the bottom wire is directed to the left.Each pair of wires is a distance a apart.The direction of the magnetic force on the middle wire

• A)is up out of the plane of the wires.
• B)is down into the plane of the wires.
• C)is in the plane of the wires,directed upwards.
• D)is in the plane of the wires,directed downwards
• E)cannot be defined,because there is no magnetic force on the middle wire.

Differentiate between various market structures (pure competition, monopolistic competition, oligopoly, and monopoly) based on their defining characteristics.

Analyze the implications of being a price taker in a purely competitive market on a firm's pricing and output decisions.

Recognize the conditions under which a purely competitive firm will achieve profit maximization or reach a break-even point.

Identify the short-run supply curve of a purely competitive firm and its relation to marginal cost and average variable cost.

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Definitions:

Positive Externalities

Benefits experienced by third parties or society at large from an economic transaction, such as improved public health or education levels, not reflected in market prices.

Subsidies

Financial support from the government to businesses, individuals, or other governmental bodies to encourage or maintain an activity that has a public good.

Liability Rules

Legal principles that determine how the responsibility for damages or losses is allocated among parties in legal disputes.

Pollution

The occurrence or entry of harmful or toxic materials into the environment.