Is universally used for windings of electrical machines because it is easily workable without any possibility of

The correct answer is copper. Copper is a good conductor of electricity and heat, and it is also relatively easy to work with. It is also relatively inexpensive, making it a cost-effective choice for windings.

Silver is also a good conductor of electricity, but it is more expensive than copper. Steel is not a good conductor of electricity, and it is also difficult to work with. Aluminum is a good conductor of electricity, but it is more likely to fracture than copper.

Therefore, copper is the best choice for windings of electrical machines.