Alexander Fufaev

Formula: Electric Field in Matter

External field is weakened in the dielectric material

Electric field (E field)

Unit
The average electric field within the dielectric (non-conductive but polarizable) material.

Electric field (E field)

Unit
External electric field in which the dielectric material is situated.

Electric susceptibility

Unit
Electric susceptibility indicates how well a material can be polarized by an external electric field \( \class{purple}{E} \). In other words, it quantifies how effectively the external electric field is weakened or strengthened within the material.
  • For \( \class{green}{\chi_{\text{e}}} > 0 \), the external electric field is amplified within the material.
  • For \( \class{green}{\chi_{\text{e}}} < 0 \), the external electric field is weakened within the material.
  • For \( \class{green}{\chi_{\text{e}}} = 0 \), it is neither weakened nor strengthened. The "material" is vacuum.
Material Electric susceptibility
Vacuum 0
Air (0°C) 0.0005
Glass 4 bis 9
Water (0°C) 87
Water (40°C) 72.4
Ice (-20°C) 15
Hydrogen Cyanide 94
Ethanol (20°C) 24.8
Electric susceptibility of some materials