a potential differance is applied btw the plates of parallel plate capacitor of area Aand seperation d,.the battery is disconnected and a dielactric of constant K is placed btw plates of capacitor of thickness t

Dear charitha,

C= K*Eo*A/D, where  Eo= 8.854x10-12

where:

K is the dielectric constant of the material,
A is the overlapping surface area of the plates,
d is the distance between the plates, and
C is capacitance