Which of the following materials is a good insulator?

JAMB Physics 2023 310 views
Source: JAMB · 2023

Which of the following materials is a good insulator?

  1. Copper
  2. Rubber ✓
  3. Silver
  4. Water
Explanation

Rubber has almost no free electrons, so it does not let current pass. That is why electricians use rubber gloves and cable coverings.

Copper and silver are very good conductors. Water, especially with impurities, also conducts.

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