Class 4 (4th Engineer) MET 📅 Jul 2025

Exam Question

(a) Briefly explain Static Induction and Dynamic Induction. (6)

(b) A coil of 250 turns is wound uniformly over a wooden ring of mean circumference 500mm and uniform cross-sectional area of 400mm². If the current passed through the coil is 4A, find (10)

(i) the magnetising force

(ii) the total flux.

Reference Answer

### (a) Explanation of Static and Dynamic Induction (6 Marks)
Based on Faraday's Laws of Electromagnetic Induction, an electromotive force (EMF) is induced in any circuit through which the magnetic flux changes. This induction can occur in two primary ways: Statically and Dynamically.
#### 1. Statically Induced EMF
A statically induced EMF is generated when the conductor remains stationary, but the magnetic field linking with it changes with time. This change in magnetic flux is typically caused by a varying current.

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