Automotive Technology
Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Chapter 18, Problem 1TF

True or False? The strength of the magnetic field in an electromagnet increases with an increase in the number of turns of wire and the current flowing through them.

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1. If two capacitors in parallel, they carry the same current. (a) True (b) False
Question 2 Calculate the amount of DC current required for the magnetic circuit given below to generate a flux density of 1.0 T in the airgap. The details are Number of turns, N = 400 The core is made up of steel, the B-H characteristic has been given below The magnetic core length, le = 500 mm The airgap length, Ig = 2 mm The cross-sectional area of the core, Ag = 100 mm² Neglect leakage and fringing. Core Cross-sectional i(1) area as Air gap Magnetic path length Figure 1 2.0 1.8 B-H Curves for Various Metals Steel 1.6 1.4 Magnetic Saturation 1.2 1.0 0.8 Iron 근 0.4 Air 0.2 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Magnetic Field Strength - H (A/m) Figure 2 Flux Density - B (T)
10 cm 1.25 100 0.05 em 30 om 6.75 0.30 625 10 cm 00 1000 Magastaing inoway (A Ts 10 cm 30 cm- A two-legged magnetic core with an air gap is shown in Fig.1. The depth of is 5 cm, the length of the airgap is 0.08 cm, and the number of turns on the coil is 800. The magnetization curve of the core material is shown in Fig.2. The magnetic field density in air gap is 0.7 T. What is the total MMFin A-Turns required to magnetize both the iron core and airgap? Nas deasiy B(T
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