A capacitor in the form of a ceramic disc 10 mm diameter and 1 mm thick is electrode to its edges. It has a capacitance of 2000 pF and a dissipation factor of 0.02. Calculate the relative permittivity of the dielectric, the dielectric loss factor, a.c. conductance at 50 Hz and at 50 MHz, and the loss current flowing for an applied sinusoidal voltage of 10 V (r.m.s.) at 1 kHz.