SH 452 · Chapter 8
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A wire of length l and radius R has a resistance 100 Ω. It is restructure into a wire of length twice and half the radius to that of initial. Calculate the resistance of new wire.
Discuss about the atomic view of resistivity. Show that the resistivity of a material wire is ρ = m/(ne²τ), Where symbols carry to their usual meaning.
Derive a relation for resistivity of a conductor ρ = m/(ne²τ) using microscopic view. From your result explain why resistivity of a conductor increases with necessary with increasing temperature.