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Q.

The plates of a parallel plate capacitor with air as medium are separated by a distance of  8mm. A medium of dielectric constant 2 and thickness 4 mm having the same area is introduced between the plates. For the capacitance to remain the same, the distance between the plates in mm is

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answer is 10.

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Detailed Solution

C0=ϵ0Ad C=ϵ0Ad't+tk

Distance between plates is (d+x)

ε0Ad=ε0Ad'-t1-1K

8=d-4+42

d=10 mm

 

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