The main function of the commutator in a simple d.c. motor is to
A
enable the armature to rotate freely
B
increase the flux linking the armature windings
C
maintain a direct current in the armature
D
provide uniform magnetic field around the armature
E
reverse the direction of the current in the armature.
Verified Correct Answer: E.
Physical Principles & Numerical Solution
Reverse the direction of the current in the armature: This ensures that the magnetic forces acting on the armature continue to produce torque in the same rotational direction, allowing for continuous motion.
Source: Myschool Past Questions Archive (Record #42842)