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A Conducting Rod Whose Length Is ℓ = 1 B⃗\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 B⃗\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 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


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

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