The distance between the plates of a parallel plate condenser is $8 m \ m$ and P.D. 120 volts . If a $6 \, m \, m$ thick slab of dielectric constant 6 is introduced between its plates, then
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If nothing is said, it is considered that battery is disconnected. Hence charge remain the same
Also $V_{air} = \frac{\sigma}{\varepsilon_0} \times d$
and $V_{medium} = \frac{\sigma}{\varepsilon_0} \left(d - t + \frac{t}{k}\right)$
⇒ ⇒ $\frac{V_{m}}{V_{a}} = \frac{\left(d - t + \frac{t}{k^{t}}\right)}{d}$ ⇒ ⇒ $\frac{V_{m}}{120} = \frac{\left(8 - 6 + \frac{6}{6}\right)}{8}$
⇒ ⇒ V m = 45V
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