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  4. Space between two concentric spheres of radii r1 and r2, such that r1 < r2, is filled with a material of resistivity ρ. Find the resistance between inner and outer surface of the material.

Q. Space between two concentric spheres of radii and , such that , is filled with a material of resistivity . Find the resistance between inner and outer surface of the material.

Current Electricity Report Error

Solution:

Since
.
(where is any radius and is small element).
Total resistance,

.
.

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