Question

when electric charges move through a conductor, which two fields form? a. a field that is perpendicular to the flow of charges b. a field that is parallel to the flow of charges c. an electric field d. a magnetic field

Explanation:

When electric charges move through a conductor (current flow), an electric field is present to drive the charges (parallel to the charge flow direction, related to option B's description but the key field type here is electric field) and a magnetic field is generated around the conductor (perpendicular to the current/charge flow direction, related to option A's description but the key field type here is magnetic field). So the two fields formed are an electric field (C) and a magnetic field (D). Options A and B describe orientations, not field types.

Answer:

C. An electric field, D. A magnetic field