An experiment was carried out to measure the electrical resistivity of a 1,50 m length gallium wire with 5×10^{-9} m^2 cross-sectional area. The two ends of the wire are given a potential difference and then the current strength in the wire is measured using an ammeter. The measurement results are tabulated in the following table.
The resistivity of the wire is
| Potential difference (V) | Current (A) |
|---|---|
| 5,25 | 0,125 |
| 5,80 | 0,138 |
| 6,30 | 0,150 |
a. 7,94×10^{-11} Ω.m
b. 4,50×10^{-10} Ω.m
c. 2,18×10^{-9} Ω.m
d. 1,20×10^{-8} Ω.m
e. 1,40×10^{-7} Ω.m