What does electromagnetic induction produce across a conductor?

Electromagnetic induction is the process by which a changing magnetic field creates an electric current in a conductor. This occurs when the conductor is exposed to a magnetic field that is changing over time, either by moving the conductor through a magnetic field or by changing the strength of the magnetic field itself.

When this magnetic field changes, it induces an electromotive force (EMF) in the conductor, which can lead to the production of voltage across the conductor. This voltage is what drives the electric current to flow through the conductor when it is part of an electrical circuit. Essentially, voltage is the potential difference that can cause current to flow, making it a direct result of the process of electromagnetic induction.

The other options relate to different electrical properties or phenomena: frequency refers to how often an alternating current changes direction in a given time frame; current refers to the flow of electric charge, which results from the induced voltage; resistance is a property of materials that limits current flow. While all of these concepts are interconnected in the framework of electrical engineering, in this specific context, the key outcome of electromagnetic induction is the production of voltage across a conductor.