hello everyone, maybe this is a stupid question but how to find those answers in the attached picture?

Thread Starter


Joined Nov 10, 2021
Right now, i'm stuck at finding the value of back emf. The following questions I think I can answer it. Since there is no value of armature resistance given, i cannot find the value of back emf using the formula Ea=V-IaRa. I am kinda newbie in this machinery subject, so, i dont know how to use the formula Ea=KΦnm. The attachment is the circuit i draw. Hope anyone can help me with this question.20211111_134954.jpg