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Analysis

Resistance is a property of objects and resistivityis that of materials. One quick–and–dirty estimate of resistivity(give or take a factor of 10)comes from multiplying resistance by the distance between the probes.Use this trick to answer the following : 1.What is the resistivity of tap water? It will be in ohm–meters (Ω·m), so take the resistance and multiply by 0.01 if the probes were 1 cm apart at the time.2.What is the resistivity of graphite?3.What about copper on the penny?4.Why wasn’t it about 10⁻⁸Ω·m?5.Is the meter still on? Shut it off!