A parallel plate condenser is connected with the terminals of a battery. The distance between the plates is $6\,mm$. If a glass plate (dielectric constant $K = 9$) of $4.5\,mm$ is introduced between them, then the capacity will become.......$times$
Medium
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(c)$C \propto \frac{1}{d}$ $==>$ $\frac{{{C_{medium}}}}{{{C_{air}}}} = \frac{d}{{d - t + \frac{t}{K}}} = \frac{6}{{6 - 4.5 + \frac{{4.5}}{9}}} = \frac{6}{2} = 3$
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