Question

Which of the following correctly lists good conductors of electricity?

• A. Glass, Wood, Plastic
• B. Silver, Copper, Iron
• C. Rubber, Paper, Air
• D. Diamond, Ebonite, Brick

Hint:

Metals are generally good conductors because of their free valence electrons.
Silver is the highest conducting metal, followed by copper and gold.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks to identify the group of materials that are categorized as good electrical conductors.

Step 2: Key Formula or Approach:
Conductors are materials that contain a high density of free mobile charge carriers (electrons) that can easily flow under the influence of an electric field.

Step 3: Detailed Explanation:

• Let us examine the materials listed in each option:
- Option (A): Glass, wood, and plastic are insulators. They do not have free electrons to conduct electricity.
- Option (B): Silver, copper, and iron are all transition metals. They have metallic bonding with a sea of free valence electrons, giving them extremely low resistivity. Silver is the best conductor of electricity, followed closely by copper. Iron is also a good metallic conductor. This group consists entirely of excellent conductors.
- Option (C): Rubber, paper, and air are insulators under normal physical conditions.
- Option (D): Diamond, ebonite, and brick are insulators.

• Therefore, Option (B) is the correct list of good conductors.


Step 4: Final Answer:
The correct group is Silver, Copper, Iron.