Consider two concentric spherical metal shells with radii a and b (a < b). The space between the shells is filled with (weakly conducting) material with conductivity σ. This "spherical resistor" is part of a circuit with the current I flowing through it. 

(a) Consider carefully the symmetries of the system.

(b) Find J and E everywhere between the shells. 

(c) Find the potential difference V between the shells, and the resistivity R of this resistor. 

(d) Is there any net charge between the shells?

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a Consider carefully the symm et ries of the system ANS WER The system has cyl ind rical symmetry me... View the full answer