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Space between two concentric spheres of radii \( r_{1} \) and \( r_{2} \), such that \( r_{1}r_{2} \), is filled with a material of resistivity \( \rho \). Find the resistance between inner and outer surface of the material.
\( \mathrm{P} \)
(a) \( \frac{r_{1}}{r_{2}} \frac{\rho}{2} \)
(b) \( \frac{r_{2}-r_{1}}{r_{1} r_{2}} \frac{\rho}{4 \pi} \)
(c) \( \frac{r_{1} r_{2}}{r_{2}-r_{1}} \frac{\rho}{4 \pi} \)
(d) None of these.
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