Jim is pulling a load along a ramp, as shown. The diagram shows the force with which he pulls and the weight of the load. a. Calculate the work done by Jim’s pulling force?

b. What is the gain in potential energy of the load?

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.