Question

The capacitance of a parallel plate capacitor with oil filled in space between plates is $40\mu \text{F}$. If oil is removed then capacitance becomes $5\mu \text{F}$. The dielectric constant of the oil is

• A. $16$
• B. $2$
• C. $4$
• D. $8$

Answer 1

The correct option is D $8$

The new capacitance with a dielecteric medium $K$ within the parallel plates is,

$C=K{C}_0$

i.e. $40=K\left(5\right)\Rightarrow K=8$