A Conducting Rod Whose Length Is ℓ = 27 $\vec { B }$

question 43

Multiple Choice

A conducting rod whose length is ℓ = 27.0 cm is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 5.00 Ω as shown in the figure.The rails and the rod are in the plane of the page.A constant $\vec { B }$ magnetic field 1.20 T in magnitude is applied perpendicular to and out of the paper.An external force exerted on the rod moves the rod to the right with a constant speed.At what speed should the rod be pulled so that the lightbulb will consume energy at a rate of 1.10 W?

• A)2.00 m/s
• B)3.50 m/s
• C)4.26 m/s
• D)6.00 m/s
• E)7.24 m/s

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