Question

maxwells discoveries included the fact that when current flows in a circuit: sound waves are distorted. heat is produced. a magnetic field is induced. light is produced.

Explanation:

Maxwell's work was in the realm of electromagnetism. According to electromagnetic theory, when current flows in a circuit, a magnetic field is induced (Ampère - Maxwell law is part of Maxwell's equations). Sound waves distortion is not related to Maxwell's main discoveries about circuits. Heat production in a circuit is mainly due to Joule's law (related to resistance, \(H = I^{2}Rt\), not Maxwell's key discovery here). Light production in a simple circuit (without specific light - emitting components like bulbs in a certain context) is not the core of Maxwell's findings about the fundamental nature of current - circuit interactions.

Answer:

a magnetic field is induced.