Tech Manual for Erjavec's Automotive Technology: A Systems Approach
Tech Manual for Erjavec's Automotive Technology: A Systems Approach
6th Edition
ISBN: 9781133933731
Author: ERJAVEC, Jack, Thompson, Rob
Publisher: Delmar Cengage Learning
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Chapter 18, Problem 1RQ

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.

Expert Solution & Answer
Check Mark
To determine

Whether the given statement is true or false.

Answer to Problem 1RQ

The correct answer is TRUE.

Explanation of Solution

Given information:

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.

The magnetic field exists around every magnet. By placing an iron bar inside the current carrying wires an electromagnet is produced. The strength of the magnetic field of these electromagnets is directly proportional to the number of turns of wire and the current flowing through them. So the above statement is true.

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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)
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