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

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plusse

Joined Nov 10, 2021
2
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
 
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