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Figure A shows two concentric metal spherical shells separated by a weakly conducting
material of conductivity (o). The inner shell has a radius of (a, = a), and the outer shell
has a radius of (a, = 3.5a ). Assume the inner shell carries a charge (Q), and the two shells
are maintained at a potential difference (V). Find:
1- The current (I) flowing from one shell to the other?
2- The resistance between the shells (R)?

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