Final answer:
The statement that a closed loop of wire does not need to enclose a changing magnetic field to induce an EMF is false. For EMF to be induced by Faraday's law, there must be a change in magnetic flux through the loop, which Lenz's law states will be opposed by the induced EMF.
Step-by-step explanation:
In Faraday's law of induction, a closed loop of wire must enclose a changing magnetic field to induce an electromotive force (EMF). If there is no change in magnetic flux through the loop—meaning that the magnetic field remains constant over time—no EMF is induced. Therefore, the statement that a closed loop of wire does not need to enclose a changing magnetic field to induce an EMF is false.
Lenz's law further clarifies that the direction of the induced EMF will always oppose the change in magnetic flux causing it. Thus, the induced EMF in a conducting loop is directly proportional to the rate of change of magnetic flux through the loop. A stationary coil in a time-varying magnetic field or a coil moving through a magnetic field can both experience changes in magnetic flux, leading to the induction of EMF.