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12. 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 round the ring to create a flux of 0.2 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? 9055

12. 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 round the ring to create a flux of 0.2 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? 9055

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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12. 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 round the ring to create a flux of 0.2 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? 9055
Transcribed Image Text:12. 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 round the ring to create a flux of 0.2 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? 9055
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