The figure below shows a top view of a bar that can slide on two frictionless ra

Question

The figure below shows a top view of a bar that can slide on two frictionless rails. The resistor is

(a) Calculate the applied force required to move the bar to the right at a constant speed of 2.30 m/s.
________________N (to the right)

(b) At what rate is energy delivered to the resistor?
________________W

The figure below shows a top view of a bar that can slide on two frictionless rails. The resistor is R = 5.40 ?, and a 2.50-T magnetic field is directed perpendicularly downward, into the page. Let (a) Calculate the applied force required to move the bar to the right at a constant speed of 2.30 m/s. ________________N (to the right) (b) At what rate is energy delivered to the resistor? ________________W l= 1.20 m.

Explanation / Answer

v = 56.55-20.8 = 35.75 m/sec

e = i*R = B*L*v...
i = B*L*v/R = 2.5*1.2*2.3/5.4 = 1.28 A....
F = B*i*L = 2.5*1.28*1.2 = 3.84 N..

B) P = i^2*R = 1.28^2*5.4 = 8.85 W

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