I am having some trouble with this question

A conducting bar moves along frictionless conducting rails connected to a 4.00-Q resistor as shown in the figure. The length of the bar is 1.60 m and a uniform magnetic field of 2.20 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 6.00 m/s? (b) At what rate is energy dissipated in the 4.00 0 resistor? 4.00 1.60 m >Fapplied Magnetic field is outward (.)