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The space between two conducting concen...

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`.

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