What is electrical succeptibility??

Arpit,

Electrical susceptibility is a dimensional proportionality constant.

It indicates the degree of polarisation of a dielectric material in response to an applied electrical field.  The greater the electric susceptibility, the greater the ability of a material to polarize  in response to the field, and thereby reduce the total electric field inside the material (and store energy). It is in this way that the electric susceptibility influences the electric permittivity of the material and thus influences many other phenomena in that medium, from the capacitance of capacitors to the speed of light.

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