Discussion
Which among the following is the most suitable material for making a commutator?
Answer: B
The most suitable material for a commutator is copper.
Commutator segments must carry the armature current with little loss and resist wear from the brushes, so they are made of hard drawn or drop-forged copper, insulated from each other with mica.
Cast steel and cast iron have far higher resistivity and would heat and spark badly. Carbon is the material of the brushes that slide on the commutator, not of the commutator itself.
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