# Dielectrics, heat capacity and polarization

Consider a dielecrtic with polarization P=(a+b/T)$\epsilon$ and heat capactiy C$\epsilon$=A+B$\epsilon$, where a and b are constants. Show that B=2bV/T2 and find the isothermal dielectric constant $\kappa$el. Use properties of G(T,$\epsilon$)

I'm really not sure where to start with this one. Any help is apreciated to get going in the right direction.
I know εVel/a
The only think I found in my notes is that C$\epsilon$=-T(∂2G/∂T2)ε but I'm not sure how that plays into the question..