Explain working principle, construction details and EMF equation of Transformer.

A transformer is a static electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. It consists of primary and secondary windings wound on a common magnetic core. The transformer operates on the principle of mutual induction and is used to step up or step down voltage levels in electrical power systems.  

### Working Principle  
The working principle of a transformer is based on Faraday’s Law of Electromagnetic Induction, which states that a time-varying magnetic field induces an electromotive force (EMF) in a conductor. When an alternating voltage is applied to the primary winding, an alternating current flows through it, producing a time-varying magnetic flux in the ____ ________ _______ _______ _________.
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