When you unplug a coffee maker that plugs into the utility outlet of your car, you notice a spark. Worried that the coffee maker might be broken, you take it apart and find that the heating element is a tungsten wire that, according to the label, is wound 600 times around what appears to be a nonmagnetic core. The core has radius \(R=2.0 \mathrm{~mm}\) and length \(\ell=200 \mathrm{~mm}\). On the outside of the coffec maker, it says \(12 \mathrm{~V}, 3. 2 \mathrm{~A}\). Where does the spark come from?