A parallel plate air capacitor has a capacitance 18 $\mu$F.If the distance between the plates is trapled and a dielectric medium is introduced, the capacitance becomes 72 $\mu$F. The dielectric constant of the medium is

Question

Dr. Abubacker · Accepted Answer

(c) $C_{0} = \frac{\varepsilon_{0}A}{d}\ $=18
$C_{0} = \frac{{K\varepsilon}_{0}A}{3d}$ =72
Dividing $Eq.\ \ (ii)\ by\ Eq.$ (i)
$\frac{k}{3} = \frac{72}{18} = 4$
$K = 12$

Q. A parallel plate air capacitor has a capacitance 18 $\mu$F.If the distance between the plates is trapled and a dielectric medium is introduced, the capacitance becomes 72 $\mu$F. The dielectric constant of the medium is

Explanation

Reviewed by Dr. Abubacker

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