Q2. (a) The interaction energy between electrical dipoles (p) and an homogenous electrical field (E) taking into account thermal fluctuation is given by: U(E,T) - -p . E coth x -- with x = PE X K T where coth is the hyperbolic cotangent function. (i) What happens to the energy and to the electrical dipoles when the extremely large electrical field is applied? (ii) Derive the Debye-Langevin susceptibility