Question

what is required for an electric charge to flow through a wire?
zero resistance in the wire
a balance of electric potential
high resistance in the wire
a difference in electric potential

Explanation:

To determine what's required for electric charge to flow through a wire, we analyze each option:

• Zero resistance (superconductors have zero resistance, but charge can flow in normal wires with resistance as long as there's a potential difference, so this isn't a requirement for general flow).
• Balance of electric potential: If potentials are balanced, there's no driving force (voltage) for charge to move, so charge won't flow.
• High resistance: High resistance opposes flow; it doesn't cause flow.
• Difference in electric potential (voltage): A potential difference creates an electric field that pushes charges (like electrons) through the wire, which is necessary for current (charge flow) to occur.

Answer:

D. a difference in electric potential