The coil of a large electromagnet has an internal resistance of R = 9. It is in series with a source of EMF of 80.75 V and a switch. The switch is...

The coil of a large electromagnet has an internal resistance of R = 9.50 Ω. It is in series with a source of EMF of 80.75 V and a switch. The switch is initially open. At t = 0 s, the switch is closed. The graph shows the electric current flowing through the coil as a function of time.

https://s1.lite.msu.edu/cgi-bin/plot.png?file=hebertsk_msu_1468598058_20042773_plot.data

What is the inductance of the coil? Please, notice that the curve passes through at least one grid intersection point.