Why is the susceptibility the second derivative of energy with respect to field?
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Hi, here is your answer......
Second derivatives in thermodynamics come from deriving other parameters :
χe=∂2H/∂E2
=∂/∂E ∂H/∂E
=∂P/∂E
The first derivative is the polarization. Then, you derive with respect to the electric field. Polarization and electric field are related, by definition, by the susceptibility.
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Second derivatives in thermodynamics come from deriving other parameters :
χe=∂2H/∂E2
=∂/∂E ∂H/∂E
=∂P/∂E
The first derivative is the polarization. Then, you derive with respect to the electric field. Polarization and electric field are related, by definition, by the susceptibility.
please mark as BRAINLIEST
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Note the origin of the minus signs in (6.1) and (6.2): the respective perturbations are Uσσ(xx) ... Second derivatives of the free energy, or generalized susceptibilities.
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