申論題

2. Ad-c voltage V is applied across a cylindrical capacitor of length L. The radi of the inner and outer conductors are R and 4R, respectively. The space between the conductors is filled with two different lossy dielectrics having, respectively, permittivity ε₁ and conductivityσ₁ in the region R＜r＜2R, and permittivity ε₂ and conductivity σ₂ in the region 2R＜K4R. Determine