# Magnetic Susceptibility

## Abstract

The susceptibility of a body to the acquisition of a magnetic moment when exposed to a magnetic field, *H*_{ a }, is its magnetic susceptibility, *χ* Ξ *M/H*_{ a }, where *M* is its magnetization. In the nonrationalized c.g.s. system of units usually employed by physicists and chemists when studying this subject, the induction, *B*, within the body is given by *B* = *H*_{ a } + 4π*M* such that its permeability, µ Ξ *B/H*_{ a }, is 1 + 4π*χ*^{ v }. The superscript, *v*, is here used to denote a “per unit volume (cm^{3}) quantity.” Other commonly employed bases for calculation and measurement are the gram and the mole, the susceptibilities corresponding to which are here denoted by *χ*^{g} and *χ*, respectively. The latter, unsuperscripted, symbol will also be used in the *general* case (just as *heat capacity* is the general counterpart of *specific heat*, to be discussed in the following chapter). In the c.g.s.-e.m.u. system, in which magnetic susceptibility is expressed in e.m.u. per unit mass, volume, etc., the unit of e.m.u. is cm^{3}; thus, χ^{ v } is dimensionless.

### Keywords

Permeability Titanium Anisotropy Graphite Depression## Preview

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