A Conducting Bar Slides Without Friction on Two Parallel Horizontal

question 27

Multiple Choice

A conducting bar slides without friction on two parallel horizontal rails that are 50 cm apart and connected by a wire at one end.The resistance of the bar and the rails is constant and equal to 0.10 Ω.A uniform magnetic field is perpendicular to the plane of the rails.A 0.080-N force parallel to the rails is required to keep the bar moving at a constant speed of 0.50 m/s.What is the magnitude of the magnetic field?

• A) 0.10 T
• B) 0.25 T
• C) 0.36 T
• D) 0.54 T
• E) 0.93 T

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Definitions:

Overextension

In language development, it's a child's use of a word in a broader context than is appropriate, indicating their learning process.

Fast Mapping

The rapid mental process by which children learn new words and concepts with minimal exposure.

Bilingual

The ability to speak and understand two languages fluently.

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A person or system capable of using or understanding only one language.