## Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

## Magnetic susceptib

The primary measurement in magnetochemistry is magnetic susceptibility. This measures the strength of interaction on placing the substance in a magnetic field. The volume magnetic susceptibility, represented by the symbol $chi_v$ is defined by the relationship

$overrightarrow{M} = chi_v overrightarrow{H}$

where, $overrightarrow{M}$ is the magnetization of the material (the magnetic dipole moment per unit volume), measured in amperes per meter ( SI units), and $overrightarrow{H}$ is the magnetic field strength, also measured in amperes per meter. Susceptibility is a dimensionless quantity. For chemical applications the molar magnetic susceptibilitymol) is the preferred quantity. It is measured in m3·mol−1 (SI) or cm3·mol−1 (CGS) and is defined as

$chi_ ext{mol} = Mchi_v/ ho$

where ρ is the density in kg·m−3 (SI) or g·cm−3 (CGS) and M is molar mass in kg·mol−1 (SI) or g·mol−1 (CGS).

A variety of methods are available for the measurement of magnetic susceptibility.

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