GATE 2026 Airstreams Renewable Full Practice Test

The magnetic path is provided by the iron core. In a transformer, the primary coil’s alternating current creates a changing magnetic field, and this flux needs a closed, low-reluctance route to couple efficiently with the secondary winding. The iron core offers high magnetic permeability, guiding most of the flux through a common loop that links the two windings and enables efficient energy transfer by mutual induction. The core is usually made of laminated iron to minimize eddy currents and energy losses; the laminations disrupt circulating currents while still forming the magnetic path. The windings themselves don’t form the path—the core does. The casing is just supportive housing.