Answer:
The poles of the magnetic field generated around the armature are attracted to the opposite poles of the permanent magnet. As the opposite poles align, the commutator reverses the current direction so like poles are aligned and the armature continues to spin.
Explanation:
It can solidify, it depends on the tempeture.
You would get 13.7
mi/51mm=3.5mm/13mm
by solving it you will B13.7mm
