Question

Select non-conductors of electricity from the following

• A. Water
• B. Pure water
• C. Rubber
• D. Paper

Answer 1

Answer: (B), (C), (D)

Paper

Conductors:

1. Conductors are materials that allow electrons to easily flow from one particle to the next.
2. Electric current can freely flow in a conductor, but not in an insulator.
3. Conductors are metals like copper, while most non-metallic solids are believed to be good insulators.

Non-conductors:

1. Non-conductors of electricity is nothing but an insulator. An insular is a substance that does not allow current to flow through them.
2. There is no free electron in insulators and insulators are bad conductors of electricity.
3. Some materials, such as wood, air, plastic, and glass, are poor conductors of electricity.

The explanation of the correct options:

In the case of option C

1. The rubber doesn't have free electrons moving around. Therefore no current can flow through it. Hence rubber is an insulator.

In the case of option D

1. Paper functions as an insulator by resisting the flow of electricity.

In the case of option B

1. There are no ions and no electrons in pure water since it does not contain any impurities such as Ca, Mg, Na, and other salts that act as charge carriers. As a result, pure water is an insulator and does not conduct electricity.

The explanation of the incorrect option:

In the case of option A

1. Water is an electrical conductor. You may have noticed that an electric wire sparks when it comes into contact with water, or that if a person touches the water, he gets electric stock.
2. Water that contains some dissolved contents like salts and current will flow due to ionic concentration.

Hence, option B, C and D are correct.