Discussion
Which function does the commutator perform beyond conducting current?
Answer: B
Segmented construction switches each coil as it crosses the neutral plane so the torque remains in one direction. Without that reversal the armature would stop after half a turn. It is what makes a direct current motor possible. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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