Consider a disconnected. Plate capacitor of capacity `10 muF` with air filled in the gap between the plates. Now one-half of the space between the plates is filled with a dielectric of dielectric constant `4` as shown in .The capacity of the capacitor changes to
.

Options

A. `25muF`
B. `20muF`
C. `40muF`
D. `5muF`

Answer

A

Explanation

Given `(epsi_(0)A)/(d)=10, C'=(epsi_(0)A//2)/(d)+(4epsi_(0)(A//2))/(d)=10[(1)/(2)+2]=25muF`.