Question

A capacitor has capacitance $5 \mu F$ when it's parallel plates are separated by air medium of thickness d A slab of material of dielectric constant $15$ having area equal to that of plates but thickness $\frac{d}{2}$ is inserted between the plates Capacitance of the capacitor in the presence of slab will be ___$\mu F$

Answer 1

The correct answer is 6.

=(3d​+2d​)∈0​A​=5d6∈0​A​
=56​×5μF=6μF