Answer :

Given: Capacitance of capacitor when medium between two plates is air, C = 8 pF = 8 × 10–12 F

Now, the capacitance of a parallel plate capacitor is given as:



where, A be the area of each plate


d be the distance between the two plates of the parallel plate capacitor


k is the dielectric constant, (for air , k = 1)


Capacitance, C = 8 pF(Given)



Suppose that the capacitance of the capacitor becomes C’ when the distance between the plates is reduced to half (d’ = d/2) and the space between them is filled with a substance of dielectric constant K = 6.



From equation (i) and (ii),


C’ = 12 x 8 x 10-12 = 96 x 10-12 = 96 pF


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