The maxwell, abbreviated as Mx, is the compound derived CGS unit of magnetic flux. The unit was previously called a line. The unit name honors James Clerk Maxwell, who presented the unified theory of electromagnetism, and was established by the IEC in 1930.
In a magnetic field of strength one gauss, one maxwell is the total flux across a surface of one square centimetre perpendicular to the field.
| This SI unit is named after James Clerk Maxwell. As with all SI units whose names are derived from the proper name of a person, the first letter of its symbol is uppercase (Mx). But when an SI unit is spelled out, it should always be written in lowercase (maxwell), unless it begins a sentence or is the name "degree Celsius".
— Based on The International System of Units, section 5.2.
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