CDCP Exam Dumps | By what are magnetic fields of the type 'H' or 'B' created?

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EXIN.CDCP.v2025-11-24.q42
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Question 3/42

By what are magnetic fields of the type 'H' or 'B' created?

A. Magnetic fields are created when an electric current flows; the greater the current, the stronger the magnetic field.

B. Magnetic fields are created by the magnetic flux of the earth which varies per month.

C. Magnetic fields are created by voltage; the greater the voltage, the stronger the magnetic field.

D. Magnetic fields are created when there is a high level of common mode noise (CMN); the greater the common mode noise (CMN), the stronger the magnetic field.

Correct Answer: A

According to the CDCP Preparation Guide1, magnetic fields of the type 'H' or 'B' are created when an electric current flows through a conductor, such as a wire or a coil. The magnetic field strength 'H' is proportional to the current 'I' and the number of turns 'N' of the coil, and inversely proportional to the length
'l' of the coil. The magnetic flux density 'B' is proportional to the magnetic field strength 'H' and the permeability '' of the medium in which the magnetic field exists. The greater the current, the stronger the magnetic field and the magnetic flux density. The relationship between 'H', 'B', 'I', 'N', 'l', and '' can be expressed by the following equations:
H = N I / l
B =H
References:
1: CDCP Preparation Guide, page 23, section 2.4.2.1 2: Difference between B and H in magnetic fields?3, page 1, section 1 4: Magnetic field | Definition & Facts5, page 1, section 1

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