(a) Consider a dielectric exposed to an alternating current field How do you think the response of the dielectric would vary as compared to a dc field? (b) A solid contains 5 x 1028 atoms/m³ each with a polarizability of 2x10-40 F-m². Assuming that the internal field to be a Lorenz field, calculate the ratio of internal field to the external field. Take the permittivity of free space as 8.854 x 10-12 Fm-¹

(a) Consider a dielectric exposed to an alternating current field How do you think the response of the dielectric would vary as compared to a dc field? (b) A solid contains 5 x 1028 atoms/m³ each with a polarizability of 2x10-40 F-m². Assuming that the internal field to be a Lorenz field, calculate the ratio of internal field to the external field. Take the permittivity of free space as 8.854 x 10-12 Fm-¹