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Now consider a much simpler scenario in which the magnetic field B→ and the velocity v→ of the metal bar are both constant, and the metal rails have been replaced by nonconducting wooden rails (which introduces a significant amount of friction, overcome by the external pulling force). (i) [3 pts] What is the magnetic force (direction and magnitude) on the metal bar in this scenario? (ii) [5 pts] What is the magnetic force (direction and magnitude) on an electron in the metal bar in this scenario? (iii) [5 pts] What is the electric field (direction and magnitude) in the metal bar in this scenario?

Now consider a much simpler scenario in which the magnetic field B→ and the velocity v→ of the metal bar are both constant, and the metal rails have been replaced by nonconducting wooden rails (which introduces a significant amount of friction, overcome by the external pulling force). (i) [3 pts] What is the magnetic force (direction and magnitude) on the metal bar in this scenario? (ii) [5 pts] What is the magnetic force (direction and magnitude) on an electron in the metal bar in this scenario? (iii) [5 pts] What is the electric field (direction and magnitude) in the metal bar in this scenario?

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Now consider a much simpler scenario in which the magnetic field B → and the velocity v → of the metal bar are both constant, and the metal rails have been replaced by nonconducting wooden rails (which introduces a significant amount of friction, overcome by the external pulling force). (i) [3pts] What is the magnetic force (direction and magnitude) on the metal bar in this scenario? (ii) [5pts] What is the magnetic force (direction and magnitude) on an electron in the metal bar in this scenario? (iii) [5pts] What is the electric field (direction and magnitude) in the metal bar in this scenario?

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A metal bar with length L, mass m, and resistance R is placed on frictionless metal rails that are inclined at an angle ϕ above the horizontal. The rails have negligible resistance. A uniform magnetic field of magnitude B is directed downward in the figure (Figure 1). The bar is released from rest and slides down the rails. Figure 1 of 1 Part A Is the direction of the current induced in the bar from a to b or from b to a ? from a to b from b to a Submit Request Answer Part B What is the terminal speed of the bar? Express your answer in terms some or all of of the variables R, m, ϕ, L, B, and acceleration due to gravity g. vt = Submit Request Answer Part C What is the induced current in the bar when the terminal speed has been reached? Express your answer in terms some or all of of the variables R, m, ϕ, L, B, and acceleration due to gravity g. 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Express your answer in terms some or all of of the variables R, m, ϕ, L, B, and acceleration due to gravity g. Submit Request Answer A metal bar with length L, mass m, and resistance R is placed on frictionless metal rails that are inclined at an angle ϕ above the horizontal. The rails have negligible resistance. A uniform magnetic field of magnitude B is directed downward in the figure (Figure 1). The bar is released from rest and slides down the rails. Figure 1 of 1 Part A Is the direction of the current induced in the bar from a to b or from b to a ? from a to b from b to a Submit Request Answer Part B What is the terminal speed of the bar? Express your answer in terms some or all of of the variables R, m, ϕ, L, B, and acceleration due to gravity g. vt = Submit Request Answer Part C What is the induced current in the bar when the terminal speed has been reached? Express your answer in terms some or all of of the variables R, m, ϕ, L, B, and acceleration due to gravity g. 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