April 2011
Intermediate to advanced
272 pages
7h 4m
English
Content preview from Hall-Effect Sensors, 2nd Edition
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Appendix A
A Brief Introduction to Magnetics
A.1 Where Magnetic Fields Come From
Magnetic fields result from the motion of electrical charges. The two most common effects that generate magnetic fields are electron spin and moving charges. Some atoms, such as iron, nickel, and cobalt, have imbalances in the total spin of the electrons in their electron shells, and this effect is ultimately responsible for these materials’ “magnetic” properties. Moving charges, such as those that form an electrical current, also develop a magnetic field.
The relationships of electric current and magnetic field in empty space under steady-state conditions can be described by:
(Equation A.1)
(Equation A.2)
where is magnetic field, I is electrical current density, ...
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