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A parallel plate capacitor is made of two square plates of side 'a', separated by a distance d(d << a). The lower triangular portion is filled with a dielectric of dielectric constant K, as shown in the figure. Capacitance of this capacitor is : K d a

1. 2 0 K a 2d(K 1) ∈ +
2. 2 0 K a d(K –1) ∈ ln K
3. 2 0 K a d ∈ ln K
4. 1 2 2 0 K a d ∈

Correct answer: 2 0 K a d(K –1) ∈ ln K

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