A student investigates how the electrical resistance of a metal wire changes with temperature.
The graph of their results is shown below.
What is the increase in the resistance of the wire between 30∘C30^\circ\text{C}30∘C and 80∘C80^\circ\text{C}80∘C?
2.0 Ω2.0\ \Omega2.0 Ω
3.2 Ω3.2\ \Omega3.2 Ω
12.2 Ω12.2\ \Omega12.2 Ω
14.2 Ω14.2\ \Omega14.2 Ω