The space between the electrodes of a parallel-plate capacitor is filled with a uniform poorly conducting medium of conductivity and permittivity . The capacitor plates

The space between the electrodes of a parallel-plate capacitor is filled with a uniform poorly conducting medium of conductivity σ and permittivity ε. The capacitor plates shaped as round discs are separated by a distance d. Neglecting the edge effects, find the magnetic field strength between the plates at a distance r from their axis if an ac voltage V = V m cos cot is applied to the capacitor.