The space between two conducting  concentric  spheres of radii `a` and `b (a lt b)` is filled up wit
Channel: Doubtnut
Date: 2021-11-08

The space between two conducting  concentric  spheres of radii `a` and `b (a lt b)` is filled up with homongeneous  poorly conducting  medium. The capacitance  of such  a system  equals  `C`. Find the resistivity  of the medium  if the potential  difference  between the spheres, when they are disconnected  from an external voltage , decreases `eta`-fold during the time interval `Delta t`.