A Circuit Is Pulled with a 21-N Force Toward the Right

question 69

Multiple Choice

A circuit is pulled with a 21-N force toward the right to maintain a constant speed v.At the instant shown,the loop is partially in and partially out of a uniform magnetic field that is directed into the paper.As the circuit moves,a 4.0-A current flows through a 6.0- resistor.

-What is the magnitude of v?

• A)1.5 m/s
• B)4.6 m/s
• C)6.4 m/s
• D)7.8 m/s
• E)9.0 m/s

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