Alternating flux links in sec. winding & induces an emf in sec. winding known as

The alternating flux that links in the secondary winding induces an electromotive force (emf) in the secondary winding. This is known as "Mutual Induction".

Here are the steps:

1. An alternating current (AC) is passed through the primary winding (input).
2. This alternating current creates a changing magnetic field around the primary winding due to Faraday's law of electromagnetic induction.
3. The changing magnetic field induces an alternating flux in the secondary winding (output).
4. According to Faraday's law, this changing magnetic flux through the secondary winding induces an electromotive force (emf).
5. This induced emf in the secondary winding is known as "Mutual Induction". It is the basic principle of operation for transformers.