The electric field radiated from an antenna is produced by which electrical property?

The correct answer, voltage, relates to how an electric field is generated from an antenna. When an antenna is energized, alternating current flows through it, creating an alternating electric field. This electric field is a result of the potential difference—voltage—applying across the antenna's elements.

The interaction between voltage and current leads to the establishment of both electric and magnetic fields, which propagate as electromagnetic waves. Thus, voltage plays a critical role because it serves as the driving force for the electrons in the antenna, resulting in current that contributes to the emission of electromagnetic radiation.

While capacitance, current, and impedance are also important properties in antenna design and function, they do not directly represent the fundamental property responsible for the creation of the radiated electric field in this context. Capacitance relates to the ability of the antenna to store charge, current is the flow of electric charge, and impedance is a measure of opposition to current flow in an AC circuit. But it is the voltage that initially creates the electric field necessary for radiation.