Describe the working principle of a Transformer.

A transformer is a crucial device in electrical engineering, commonly used to transfer electrical energy from one circuit to another through electromagnetic induction. Its working principle revolves around the fundamental laws of electromagnetic induction discovered by Michael Faraday and formulated mathematically by James Clerk Maxwell.

The basic structure of a transformer consists of two coils of wire, known as the primary and secondary coils, wrapped around a common magnetic core typically made of laminated iron or steel. These coils are electrically isolated but magnetically coupled through the core. When an alternating current (AC) passes through the primary coil, it generates a changing magnetic field around it according to Faraday's law of electromagnetic induction. This changing magnetic _____ ________ _______ _____ _____ ___ __________ _______.
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