As Norm Chris posed a question a couple days ago, ( how many degrees out of phase is 3 phase), I would like to ask that question of 2 phase (yes, there still is 2phase being used).
How many degrees are there between each phase of 2phase power? Answer choices: 30,45,60,80,90,120,145,160,180,270,
note- unlike 3phase that always shows 3 coils in a diagram, 2phase can be represented in a diagram with 2coils or with 4 coils. good luck. And the prize: personal satisfaction.