The Fourier transform of a linear response function gives a “generalized” form of this quantity whose imaginary and real parts are related by the Kramers–Krönig relations. This quantity’s (-5[1])magnetic form can be measured with a torsional balance named for Evans. (15[1]-5[1])In (-5[1])ferromagnetic crystals, this quantity is a tensor of the partial derivatives of the i-th component of M with respect to the j-th component of H. The temperature dependence of this quantity above the Curie (15[1])temperature is described (-5[1])by the (*) Curie-Weiss (-5[1])law. This quantity's “electric” form is the constant of proportionality between (-5[1])a material’s polarization (10[2]-5[2])and the external E-field, (10[1]-5[2])and equals the dielectric constant minus (10[1])one. (10[2]-5[1])For 10 points, (10[1]-5[1])name this quantity symbolized chi (-5[1])that describes a material’s (10[1])response (10[1]-5[1])to external electric (-5[2])or magnetic (-5[1])fields. (10[2]0[1]-5[1])■END■ (10[7]0[23])