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Unformatted text preview: What is the current in the silver section? (c) What is the magnitude of E in the copper? (d) What is the magnitude of E in the silver? (e) What is the potential difference between the ends of the silver section of wire? • 25.66 The region between two concentric conducting spheres with radii a and b is filled with a conducting material with resistivity ρ . (a) Show that the resistance of the spheres is given by: • (b) Derive the expression for the current density as a function of the radius, in terms of the potential difference V ab between the spheres. (c) Show that the result in part (a) reduces to: • when the separation between the spheres L=ba is small....
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 Winter '11
 Winn
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