The resistivity of Play-doh was measured using a similar technique to the one we used in class for the brass wire. As shown in the figure below, a long cylinder (log) of Play-doh was rolled, and the voltage and current for various lengths was measured. power ammeter supply -+ The experiment: 1. Measure V and I for different lengths of Play-doh. - - Play-doh 2. Determine R for that length of Play-doh using Ohm's law (R = V/1) AV for this length voltmete If the diameter of the Play-doh 'log' (cylinder) used for the experiment is 13 mm, determine the cross-sectional area of the Play-doh log. 1.3E-4 A graph of resistance vs. length for the data collected is shown below, along with a linear trendline fit. Play-doh resistance vs length resistance () length (m) You can find the data in this Excel file: play-doh-resistivity. Using Excel, or another fitting program, use the data to reproduce the resistance vs. length graph for yourself. Fit the data (all data points) with a linear fit or trendline. What value do you get for the slope? IX What are the units for the slope? Comparing the equation from your fit, R = (slope)*L + b, with the equation relating resistance and resistivity, R = p*L/A, how can you get the resistivity, p, from the slope? O p = slope O p = slope*A O p = slope/A What value do you get for the resistivity of neon green Play-doh? * 0*m