A conductive thin spherical shell with radius r1=1mm is placed in the center of another conductive spherical shell with radius r2=2mm. The region between the shells is filled with a material with resistivity ρ = 2x10-6 Ω.m. Assuming that the total I=2A current flows from the inner shell to the outer shell along the radius; a. the potential difference between the shells, b.Find the resistance between the shells. ( π=3.14)

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.