The rotating armature consists of one or more coils of wire wound around a laminated, magnetically "soft" ferromagnetic core. Current from the brushes flows through the commutator and one winding of the armature, making it a temporary magnet (an electromagnet). The magnetic field produced by the armature interacts with a stationary magnetic field produced by either PMs or another winding a field coil, as part of the motor frame. The force between the two magnetic fields tends to rotate the motor shaft. The commutator switches power to the coils as the rotor turns, keeping the magnetic poles of the rotor from ever fully aligning with the magnetic poles of the stator field, so that the rotor never stops (like a compass needle does), but rather keeps rotating as long as power is applied.
What element of the motor keeps the poles from alligning?
commutator

Most common are historical works where the protagonist is either a samurai or former samurai (or another rank or position) who possesses considerable martial skill. Eiji Yoshikawa is one of the most famous Japanese historical novelists. His retellings of popular works, including Taiko, Musashi and Heike Tale, are popular among readers for their epic narratives and rich realism in depicting samurai and warrior culture.[citation needed] The samurai have also appeared frequently in Japanese comics (manga) and animation (anime). Samurai-like characters are not just restricted to historical settings and a number of works set in the modern age, and even the future, include characters who live, train and fight like samurai. Examples are Samurai Champloo, Requiem from the Darkness, Muramasa: The Demon Blade, and Afro Samurai. Some of these works have made their way to the west, where it has been increasing in popularity with America.
Why are Eiji Yoshikawa's books popular?
for their epic narratives and rich realism in depicting samurai and warrior culture

In its turn, under anaerobic conditions, the ferrous hydroxide (Fe(OH)
2 ) can be oxidized by the protons of water to form magnetite and molecular hydrogen. This process is described by the Schikorr reaction:
What reaction describes this process?
Schikorr reaction