Question

Rectangular copper coil together with slip rings are called

Answer 1

I think so the answer is armature.

Answer 2

   Rectangular copper coil together with slip rings are constructed together to produce an ample amount of current therefore it is power production unit of an electric machine which is called as an Armature.

   An armature is either rotating coil or coils constructed in a dynamo for which the slip rings are used and they function either in static motion or in dynamic motion to produce power and function as essential to electric motor.