DIELECTRIC

There is an airfilled capacitor of capacity C. when the plate separation is doubled and a dielectric is introduced between the plates, the capacitance becomes 2 C. the dielectric constant of the dielectric is

The region of space between the plates of a parallel-plate capacitor is filled with a liquid dielectric with a dielectric constan in_1 . • A solid dielectric wi th a dielectric. constant in_2 is immersed in the liquid. The lines of force in t.he liquid have the shape shown in the figure. Which of the two dielectric constants is greater?

A parallel plate capacitor with a dielectric slab with dielectric constant k= 3 filling the space between the plates is charged to potential V and isolated. Then the dielectric slab is drawn out and another dielectric slab of equal thickness but dielectric constant k'= 2 is introduced between the plates. The ratio of the energy stored in the capacitor later to that initially is: