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A magnetic core in the form of a closed circular ring has a mean length of 30 cm and a cross- sectional area of 1 cm2. The relative permeability of iron is 2400. What direct-current will be needed in the coil of 2000 turns uniformly wound around the ring to create a flux of 0.20 mWb in iron? If an air-gap of 1 mm is cut through the core perpendicular to the direction of this flux, what current will now be needed to maintain the same flux in the air gap? [0.0995 A, 0.8955 A]

A magnetic core in the form of a closed circular ring has a mean length of 30 cm and a cross- sectional area of 1 cm2. The relative permeability of iron is 2400. What direct-current will be needed in the coil of 2000 turns uniformly wound around the ring to create a flux of 0.20 mWb in iron? If an air-gap of 1 mm is cut through the core perpendicular to the direction of this flux, what current will now be needed to maintain the same flux in the air gap? [0.0995 A, 0.8955 A]

Introductory Circuit Analysis (13th Edition)
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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A magnetic core in the form of a closed circular ring has a mean length of 30 cm and a cross- sectional area of 1 cm2. The relative permeability of iron is 2400. What direct-current will be needed in the coil of 2000 turns uniformly wound around the ring to create a flux of 0.20 mWb in iron? If an air-gap of 1 mm is cut through the core perpendicular to the direction of this flux, what current will now be needed to maintain the same flux in the air gap? [0.0995 A, 0.8955 A]
Transcribed Image Text:A magnetic core in the form of a closed circular ring has a mean length of 30 cm and a cross- sectional area of 1 cm2. The relative permeability of iron is 2400. What direct-current will be needed in the coil of 2000 turns uniformly wound around the ring to create a flux of 0.20 mWb in iron? If an air-gap of 1 mm is cut through the core perpendicular to the direction of this flux, what current will now be needed to maintain the same flux in the air gap? [0.0995 A, 0.8955 A]
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