Which of the following materials is a good insulator?
A
Silver
B
Water
C
Rubber
D
Copper
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Rubber is a good insulator because it does not allow electrons to flow through it easily. Copper, silver, and water are all good conductors of electricity.
Source: WAEC / JAMB / NECO Classroom Archive (Record #68576)