Class 4 (4th Engineer) MET 📅 Dec 2025

Exam Question

(a) Explain Fleming’s Right hand rule. (6)

(b) A one-turn armature coil has an axial length of 0.4m and a diameter of 0.2m. It is rotated at a speed of 500 rev/min in a field of uniform flux density of 1.2T. Calculate the magnitude of the e.m.f. induced in the coil. (10)

Reference Answer

### Part (a): Fleming’s Right-Hand Rule (6 Marks)
Fleming's Right-Hand Rule is a fundamental principle in electromagnetism used to determine the direction of the induced electromotive force (e.m.f.) or current in a conductor when it moves through a magnetic field. This is the underlying principle of operation for electrical generators.
**1. Mnemonic and Orientation:**
The rule is applied by extending the thumb, forefinger (index finger), and middle finger of the right hand so that they are mutually perpendicular to each other, forming a three-axis coordinate system.

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