Question: Q. 5. Two identical capacitors of plate dimension l×b and plate separation d have dielectric slabs filled in between the space of the plates as shown in the figures.

Obtain the relation between the dielectric constants κ,κ1 and κ2.

A [O.D. Comptt. I, II, III 2013]

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Solution:

Ans. The capacitor can be considered as split into two capacitors connected in parallel.

Here C1=κ1ε0 A/2d,C2=κ2ε0 A/2d

1/2

In parallel combination,

Ceq=C1+C2 Ceq=κ1ε0 A2d+κ2ε0 A2d

From this figure

$$ \begin{equation*} \mathrm{C}{e q}=\frac{\kappa \varepsilon{0} \mathrm{~A}}{2 d} \tag{ii} \end{equation*} $$

From (i) and (ii)

κε0 A2d=ε0 A2d(κ1+κ2) κ=κ1+κ2



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