What is induced in a coil of wire when there is a change in its surrounding magnetic field?

When there is a change in the magnetic field surrounding a coil of wire, this phenomenon leads to the generation of an electromotive force (EMF) within the coil, which is effectively described as voltage. This process is based on Faraday's law of electromagnetic induction, which states that a change in magnetic flux through a coil induces an EMF in the coil.

This induced voltage can cause a current to flow in the circuit if the circuit is closed, but the fundamental concept being assessed here is the relation between the changing magnetic field and the corresponding voltage that is generated. A change in magnetic field does not directly induce resistance, power, or current without the presence of a complete circuit that allows current to flow, making voltage the essential phenomenon that occurs due to the changes in the magnetic field.