. (i) An air-cored solenoid has 350 turns and a length of 200 mm. A current of 75 mA flows through the solenoid. Calculate the flux density along the axis at the centre of the solenoid. (You may assume that the solenoid is sufficiently long and thin for the field outside the solenoid to be neglected with respect to the field inside the solenoid). (ii) Estimate the flux density at each end of the solenoid of 4(i) if an iron core having a relative permeability of 1500 is placed tightly inside the core of the solenoid.

. (i) An air-cored solenoid has 350 turns and a length of 200 mm. A current of 75 mA flows through the solenoid. Calculate the flux density along the axis at the centre of the solenoid. (You may assume that the solenoid is sufficiently long and thin for the field outside the solenoid to be neglected with respect to the field inside the solenoid). (ii) Estimate the flux density at each end of the solenoid of 4(i) if an iron core having a relative permeability of 1500 is placed tightly inside the core of the solenoid.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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2.3
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Consider the magnetic circuit in Figure. Assuming that the core µ= 1000µo has a uniform cross section of 4 cm2,N= 400 , the flux density in the air gap. 0.2 A L = 42 cm 4 = 0.1 cm 35.4 mwb 60.5 mwb 70.8 mwb Non of These
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Find the ratio of exciting currents with and without a 1mm air gap in a magnetic core of mean length 50cms and relativepermeability of 2500 and cross-section of 1cm 2 in a 1000 turn coil wound on the core. The flux density in both cases must be1T.
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