What two things happen when current flows through a conductor?

• A. Heat is generated and a magnetic field surrounds the conductor.
• B. Voltage increases with distance
• C. Conductor becomes superconductive
• D. Current stops

Answer: (A)

When current flows through a conductor, energy is converted into heat and a magnetic field is created around the conductor.

Heat generation happens because electrons collide with atoms in the material, turning part of the electrical energy into thermal energy. The rate of heat produced is proportional to I^2R, so higher current or higher resistance leads to more heat. This resistive heating is a fundamental reason wires and components heat up under load.

Around the conductor, a magnetic field forms that encircles the wire. The field strength grows with the current, and its direction is given by the right-hand rule: point your thumb in the direction of the current and your fingers curl in the direction of the magnetic field.

Voltage increasing with distance isn’t a universal outcome of current flow; voltage can drop along a conductor due to resistance. Conductors becoming superconductive is a special case that requires extremely low temperatures and is not the normal behavior of everyday conductors. Current stopping would only happen if the circuit is opened or the source is removed, not simply because current is flowing.