The insulating material for cables should A) Acid proof B) Non-inflammable C) Non-hygroscopic D) All the above properties Related MCQs: The insulating material used between the commutator segments is Two wires A and B of the same material and length l and 2I have radius r and 2r respectively. The ratio of their specific resistance will be The commonly used material for shielding or screening magnetism is Which material is used in normal pencil?