Class 4 (4th Engineer) MET 📅 Jan 2023

Exam Question

(a) Explain mutual induction with the help of two insulated coils (6)

(b) A coil of 800 turns is wound on a wooden former and a current of 5A is passed through it to produce a magnetic flux of 200 micro-webers. A secondary coil of 2000 turns is wound on it. Find the emf induced in the secondary coil when the current is switched off in 0.08sec.

Reference Answer

### (a) Mutual Induction
Mutual induction is a fundamental principle of electromagnetism where a change in current in one coil induces an electromotive force (EMF) or voltage in an adjacent, electrically isolated coil. This phenomenon is the basis for the operation of transformers, motors, generators, and other inductive devices.
**1. Principle and Setup:**
* Consider two coils, a **Primary Coil (Coil 1)** and a **Secondary Coil (Coil 2)**, placed in close proximity to each other. They are not physically or electrically connected.

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