A Conducting Rod Whose Length Is ℓ = 1 $\vec { B }$

question 85

Multiple Choice

A conducting rod whose length is ℓ = 1.60 m is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 4.00 Ω as shown in the figure.The rails and the rod are in the plane of the page.A constant uniform $\vec { B }$ field of 2.20 T in magnitude is applied perpendicular to and out of the paper.What is the magnitude of the external force needed to move the rod to the right with a constant speed of 6.00 m/s?

• A)8.60 N
• B)9.30 N
• C)10.6 N
• D)12.6 N
• E)18.6 N

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