Which statement describes electromagnetic induction?

Which statement describes electromagnetic induction?

• A. Using a magnetic field to induce electric current
• B. Storing energy in a capacitor
• C. Using an electric current to produce a magnetic field
• D. Converting mechanical energy to electrical energy

Answer: (A)

Electromagnetic induction is about generating electric current in a conductor because a magnetic field is changing. When a magnet moves toward or away from a coil, or when the coil spins in a magnetic field, the magnetic flux through the coil changes over time. This changing flux induces an electromotive force, which pushes charges and creates current in the circuit. That’s why the statement describing electromagnetic induction is about using a magnetic field to induce electric current. The other ideas describe different concepts: storing energy in a capacitor involves electric field energy, not inducing current; using a current to produce a magnetic field is about how current creates magnetism rather than induction; and converting mechanical energy to electrical energy is a general energy transformation, which induction can enable but doesn’t by itself define.

Electromagnetic induction is about generating electric current in a conductor because a magnetic field is changing. When a magnet moves toward or away from a coil, or when the coil spins in a magnetic field, the magnetic flux through the coil changes over time. This changing flux induces an electromotive force, which pushes charges and creates current in the circuit.

That’s why the statement describing electromagnetic induction is about using a magnetic field to induce electric current. The other ideas describe different concepts: storing energy in a capacitor involves electric field energy, not inducing current; using a current to produce a magnetic field is about how current creates magnetism rather than induction; and converting mechanical energy to electrical energy is a general energy transformation, which induction can enable but doesn’t by itself define.