Three parallel plate capacitors C 1 , C 2 and C 3 each of capacitance 5 μ F are connected as shown in figure. The effective capacitance between points A and B, when the space between the paralle

Question

Three parallel plate capacitors C 1 ​ , C 2 ​ and C 3 ​ each of capacitance 5 μ F are connected as shown in figure. The effective capacitance between points A and B, when the space between the parallel plates of C 1 ​ capacitor is filled with a dielectric medium having dielectric constant of 4, is :

TestHub · Accepted Answer

After dielectric ​ C 1 ​ = 4 C C 1 ​ = 4 × 5 = 20 μ F C 2 ​ = C 3 ​ = 5 μ F ​ C 1 ​ & C 2 ​ are in series which is parallel to C 3 ​ So ​ C c q ​ = C 1 ​ + C 2 ​ C 1 ​ C 2 ​ ​ + C 3 ​ ⇒ 20 + 5 20 × 5 ​ + 5 = 4 + 5 = 9 μ F ​ Correct Option (3)

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