Answer:
It is due to problem in commutator or split rings that reverse the current in the coil by which the armature completes its rotation.
Explanation:
motor is an assembly of shaft, coil, core, split rings (commutator), and radial magnetic field. it works on the force acting on the current carrying conductor when it is kept in a magnetic field, the force acting is given by
F=i.l.b
here i is current, l is length of the conductor, and b is magnetic field.
the force acting on the opposite sides of the coil makes a couple that rotates the coil. In this way the armature rotates. Commutator reverse the current in each cycle so that the arm that comes closer to the definite pole having same direction.
it is piece of laminated soft iron, kept on the shaft but isolate. It has slots in which coil is wrapped.
the region around a magnet in which a unit north pole feels either force of attraction or repulsion is called magnetic field. Its unit is tesla.
https://brainly.com/question/19542022
#SPJ2
