What is the effect of introducing a conductor into a changing magnetic field?

Introducing a conductor into a changing magnetic field results in the induction of an electric current within the conductor. This phenomenon is based on Faraday's law of electromagnetic induction, which states that a change in the magnetic environment of a coil of wire will induce a voltage (and hence a current if the circuit is closed).

When the magnetic field around the conductor changes, whether the magnet is moving, or the conductor itself is moving in a stationary magnetic field, the change creates an electromotive force (EMF) in the conductor. This EMF drives the flow of charge carriers, resulting in an induced current. The direction of the induced current will depend on the orientation of the magnetic field and the direction of the movement or change, as described by Lenz's law, which states that the induced current will flow in a direction that opposes the change that produced it.

The other choices do not accurately represent the behavior of a conductor in a changing magnetic field. For instance, increasing resistance does not necessarily occur simply due to introducing a conductor into a magnetic field, nor does it neutralize or enhance the magnetic field itself. Instead, the key outcome is the induction of current, which demonstrates the fundamental principles of electromagnetism in action.