Torque: a Circular Coil of Wire of 200 Turns and Diameter

question 58

Multiple Choice

Torque: A circular coil of wire of 200 turns and diameter 2.0 cm carries a current of 4.0 A. It is placed in a magnetic field of with the plane of the coil making an angle of 30° with the magnetic field. What is the magnetic torque on the coil?

• A) 0.15 N ∙ m
• B) 0.088 N ∙ m
• C) 0.29 N ∙ m
• D) 0.40 N ∙ m
• E) 0.076 N ∙ m

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Definitions:

Perfect Competitor

An idealized market structure where many firms sell identical products, and there are no barriers to entering or exiting the market.

Total Profit

The overall financial gain made by a business after subtracting all expenses from the total revenue generated.

Herfindahl-Hirschman Index

A measure used to assess the level of market concentration and competition within an industry, calculated by squaring the market share of each firm competing in the market and then summing the resulting numbers.

Concentration Ratio

A measure of the total market share that is controlled by a specified number of the largest firms in the industry.