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

Question

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

Quizplus · Accepted Answer

The Answer of 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 Conducting Rod Whose Length Is ℓ = 1 B⃗\vec { B }B

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