Question

Two idential parallel plate capacitors are connected in sereis to a cell of `120V`. A dielectric slab `(K=3)` in placed in one of the capacitor. The p.d., across the capacitors will now be
A. `20V,100V`
B. `30V,90V`
C. `40V,80V`
D. `60V,60V`

Answer 1

Correct Answer - B
`V_(1)=((3C)/(C+3C))xx120=90V`
`V_(2)=120-V_(1)=30V`