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Magnetic Units of Measurement
16 questions By Tony R. Kuphaldt
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Question 16 of 16
Using a B-H curve obtained from a reference book, determine the amount of magnetizing force (H) required to establish a magnetic flux density of 0.2 T in a cast iron torus with a cross-sectional area of 7 ×10−4 square meters.
Calculate the amount of current necessary in the wire coil to establish this amount of flux, if the coil has 250 turns, and the torus has an average flux path length of 45 cm. Also, calculate the amount of magnetic flux (Φ) inside the torus.
Reveal answerH = 400 At/m
I = 720 mA
Φ = 1.4 mWb
Notes:I obtained the magnetizing force figure of 400 At/m for 0.2 T of flux density, from Robert L. Boylestad’s 9th edition of Introductory Circuit Analysis , page 437.
