Question

slab of material of dielectric constant K has the same area as the plates of a parallel plate capacitor but has a thickness 3D by 4 find the ratio of the capacitance with dielectric inside it to its capacity sense without the dielectric​

Answer 1

capacitance without dielectric is given as,

C=E•A/D

we know that capacitance increases in the presence of dielectric

C ' = KE•A/3D/4

C ' =4KE•A/3D

ratio of C ' and C

C ' /C=4K/3

I hope this helps ( ╹▽╹ )