Conducting rail xL X Figure above shows the lamp shines when the rod length L is connected to a circuit and moves to right at a speed v. Given the internal resistance of the lamp is R. (a) Explain why the lamp shines and discuss what parameters directly affect the brightness of the lamp? (b) In terms of v, B, L, and R, what is the current in the rod? (c) In terms of v, B, L, and R, what is the magnitude of the magnetic force on the rod? (d) What is the direction of the magnetic force on the rod?

Conducting rail xL X Figure above shows the lamp shines when the rod length L is connected to a circuit and moves to right at a speed v. Given the internal resistance of the lamp is R. (a) Explain why the lamp shines and discuss what parameters directly affect the brightness of the lamp? (b) In terms of v, B, L, and R, what is the current in the rod? (c) In terms of v, B, L, and R, what is the magnitude of the magnetic force on the rod? (d) What is the direction of the magnetic force on the rod?