Answer
a) Ohm's Law is $V=IR$ This shows a linear relationship between voltage and current so can be graphed with a line.
b) See image
The wire does obey Ohm's law.
y-intercept of -0.000438
$R=0.00139\Omega$
c) $\rho=1.02\times10^{-9}\Omega m$
This may be iron or platinum
Work Step by Step
a) Ohm's Law is $V=IR$ This shows a linear relationship between voltage and current so can be graphed with a line. When voltage is 0, current is 0, so the y intercept will be 0. With V on the x axis and I on the y axis, the slope will be 1/R, but with I on the x axis and V on the y axis, the slope will be the value of resistance.
b)
The wire does obey Ohm's law. I obtained a straight line with a y-intercept of -0.000438, which is within the value of significant figures.$R=0.00139\Omega$
c) $\rho=\frac{RA}{l}=\frac{(0.00139\Omega)(8.04\times10^-8m^2)}{(0.11m)}=1.02\times10^{-9}\Omega m$
This may be iron or platinum
