Aloop of wire carries a current. the resulting magnetic field . points toward the loop at all pointsb. points away from the loop at all pointsc. is similar to that of a bar magnet in the plane of the loopd. is similar to that of a bar magnet perpendicular to the plane of the loop

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

Since the pully is a simple machine so the mechanical advantage is a 1