Question

Which one of the following materials is the best insulator?
a.Brass
b.copper
c.Rubber
d.Iron

Answer 1

rubber is the best insulator

Answer 2

Among the given materials rubber is the best insulator.

• Rubber in common is a good insulator because rubber does not conduct specific heat and slows down the mobile electrons.  
• The active role of an excellent insulator efficiently is to typically avoid or typically decrease the effective rate of electrons passing through the wire.  
• Since rubber gains no free electrons that can travel freely when specific charges are properly placed on the wire, this naturally makes it a more potent insulator.