1. A coil is wound uniformly with 300 turns over a steel ring of relative permeability 900, having a mean circumference of 40 2 mm and cross-sectional area of 50 mm². If a current of 25 amps is passed through the coil, find (a) m.m.f. (b) reluctance of the ring

1. A coil is wound uniformly with 300 turns over a steel ring of relative permeability 900, having a mean circumference of 40 2 mm and cross-sectional area of 50 mm². If a current of 25 amps is passed through the coil, find (a) m.m.f. (b) reluctance of the ring

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Wheatstone Bridge Method

A Wheatstone bridge is a circuit used to measure unknown resistance by measuring the ratios of the two branches of the circuit such that each branch has two resistance and out of four resistance one is unknown. The two branches are joined in between with the help of galvanometer which is used to determine the direction of the current. The main advantage of this circuit is that it can provide the most accurate measurement (different from a simple voltage separator).

Question

1. A coil is wound uniformly with 300 turns
over a steel ring of relative permeability
900, having a mean circumference of 40
2
mm and cross-sectional area of 50 mm². If
a current of 25 amps is passed through the
coil, find (a) m.m.f. (b) reluctance of the ring
and (c) flux. Ans: [(a) 7500 AT (b) 0.7 x 106
AT/Wb (c) 10.7 mWb]

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