Magnetic induction is a phenomenon that occurs when a magnetic field changes with time, causing an induced electromotive force (EMF) to be generated in a nearby conductor. This process is fundamental to the functioning of many devices in our everyday lives, such as electric generators and transformers.

To understand magnetic induction, let's consider a simple scenario. Imagine we have a straight wire and we pass a magnet through its center. As the magnet moves, the magnetic field around the wire changes, inducing a current in the wire. This current, known as an induced current, creates a magnetic field around the wire that opposes the change in the initial magnetic field.

One useful concept in magnetic induction is the flux, which represents the total magnetic field passing through a given area. The unit of flux is the weber (Wb). When the flux changes with time, an EMF is induced in a nearby conductor, according to Faraday's Law of Induction.