Correct option is C
A transformer works on the principle of mutual induction. So the answer is (c).
Explanation: A transformer uses two coils, a primary and a secondary, where a changing magnetic field in the primary coil induces a voltage in the secondary coil due to the phenomenon of mutual induction.
Self-induction: This occurs when a changing current in a coil induces a voltage within the same coil.
Static induction: This refers to the electric field induced on a conductor due to a nearby charged object, not relevant to transformer operation.
Dynamic induction: This involves generating voltage through relative motion between a conductor and a magnetic field, which is not how a transformer works.
