The two metallic plates of radius 
are placed at a distance 
apart and its capacity is 
. If a plate of radius 
and thickness 
of dielectric constant 6 is placed between the plates of the condenser, then its capacity will be
Text Solution
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Area of the given metallic plate A = π π r 2
Area of the dielectric plate 
Uncovered area of the metallic plates 
The given situation is equivalent to a parallel combination of two capacitor. One capacitor (C') is filled with a dielectric medium (K = 6) having area 
while the other capacitor (C'') is air filled having area 
Hence 
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