# In the arrangement shown in the figure, the resistor is 4 Ω and a 4 T magnetic field is directed into the paper. The separation between the rails is 1 m . An applied force moves the bar to the left at a constant speed of 8 m/s. In the arrangement shown in the figure, the resistor is 4 Ω and a 4 T magnetic field is directed into the paper. The separation between the rails is 1 m . An applied force moves the bar to the left at a constant speed of 8 m/s.

Calculate the applied force required to move the bar to the left at a constant speed of8 m/s. Assume the bar and rails have negligible resistance and friction. Neglect the mass of the bar. Answer in units of N.

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