Which component does not rely on electromagnetic induction?

• A. A Transformer
• B. An Inductor
• C. A Capacitor
• D. A Coil

Answer: (C)

The question tests understanding of what relies on electromagnetic induction. Electromagnetic induction involves generating or changing voltages by altering magnetic flux linked to a conductor or coil.

A transformer uses a changing magnetic flux in its core to induce voltage in the secondary winding, so it relies on induction. An inductor relies on self-induction: a changing current creates a changing magnetic field that induces an opposing emf and stores energy magnetically. A coil is a wound conductor that serves as the basic form for inductors and transformers, hinging on magnetic coupling and induction. A capacitor, on the other hand, stores energy in the electric field between its plates and does not depend on changing magnetic flux to operate, so it does not rely on electromagnetic induction.