Question

A parallel plate capacitor with air has a capacity of $8pF$. Calculate the capacity of the capacitor if the distance between the plates in halved and the space between them is fully filled with a substance of dielectric constant $5$.

Answer 1

Capacitance is given by:

$C=\frac{K{\epsilon }_{o}A}{d}$

$K^{\prime }=5$

$d^{\prime }=d/2$

$⟹C^{\prime }=10C=80pF$