Final answer:
Moving a coil of wire over a magnet induces an electromotive force but does not directly create light. It generates electricity which can power a light-emitting device.
Step-by-step explanation:
When you move a coil of wire over a magnet, you induce an electromotive force (EMF) in the coil thanks to the principle of electromagnetic induction. This happens because the magnetic field is changing relative to the coil. However, this does not directly create light. Observe that the movement of a wire over a magnet would not by itself produce visible light; it generates electricity which can then be harnessed to power devices, such as a light bulb, that emit light.
The strength of the magnetic field created by current in a long straight wire, according to the given formula B = µ₀I/(long straight wire), indicates the magnetic field (B) is directly proportional to the current (I) carried by the wire, and inversely proportional to the distance from the wire. This relationship is key for understanding the magnetic effects around current-carrying wires but is not directly related to the creation of light when moving a wire over a magnet.