The motion of electrons in a conductor caused by the interaction between the magnetic field of a magnet and the magnetic field of the electrons causes a voltage to be ?

• A. Induced
• B. Eliminated
• C. Regulated
• D. Sped Up

Answer: (A)

The concept being tested is electromagnetic induction: a magnetic field acting on moving charge carriers in a conductor can produce an electromotive force, or voltage. When electrons move through a conductor in the presence of a magnetic field, they experience the Lorentz force q(v × B), which pushes them to one side. This separation of charges creates a potential difference across the conductor—the induced voltage (emf). If the circuit is closed, this emf can drive current. The other options don’t describe this process: the interaction doesn’t “eliminate,” “regulate,” or “speed up” voltage in this context. The correct idea is that the interaction induces a voltage.