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B5 practical: Resistivity of Play Doh

Play Doh is modelling clay made out of flour oil and salt, the salt content enables it to conduct electricity so it has a measurable resistance. In this experiment the resistance of a cylinder of play Doh will be measured as it is squashed between 2 metal plates.The resitivity of a conductor is given by R=ρL/AWhere:ρ = resistivityL = lengthA = Cross sectional areaThe sample to be squashed has a constant volume V=AL

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