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he space between two conducting concentric spheres of radii \( a \) and \( b(ab) \) is filled up with homogeneous poorly
\( \mathrm{P} \) conducting medium. The capacitance of such a system equals W 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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