A student builds an electromagnet, as shown. Will the compass needle move when brought near the electromagnet, and why?
A. Yes. The needle of a compass changes direction randomly when brought near the electromagnet.
B. No. The needle of a compass will not react because the wires are not connected to the battery properly in order to create a working electromagnet.
C. No. The needle of a compass only aligns itself with an electric field, which cannot be created by the electromagnet.
D. Yes. The needle of a compass aligns itself with the magnetic field created by the

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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.