A conducting bar moves along frictionless conducting rails connected to a 4 resistor as shown in the figure. The length of the bar is

• A conducting bar moves along frictionless conducting rails connected to a 4 Ω resistor as shown in the figure. The length of the bar is 1.6 m and a uniform magnetic field of 2.2 T is applied perpendicular to the paper pointing outward, as shown. (a) What is the applied force required to move the bar to the right with a constant speed of 6 m/s? (b) At what rate is energy dissipated in the 4 Ω resistor?