Ow is an electromagnet different from a bar magnet?

question 3 options:

a. only a bar magnet has a magnetic field.

b. only an electromagnet attracts materials made of iron.

c. an electromagnet is temporary and is magnetic when a current flows through a wire wrapped around the core.

d. a bar magnet is a temporary and is only magnetic when a current flows through a wire wrapped around the core.

I think the answer is A or D

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.