Relation between mechanical and electrical angle

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I want to knw what is the relation between mechanical and electrical angle. Further how we can decide what will be the electrical angle between two coils.
 
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Are you talking about AC phase angle, or something entirely different? As is, your post doesn't have enough information to begin the discussion.
 
If you are talking about motors and generators, then, In a 2 pole machine
Electrical Angle = Mechanical Anlge
In a 4 pole machine
Electrical Angle = 2 times Mechancal Angle