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

Question

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

Quizplus · Accepted Answer

The Answer of 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

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

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