Question

which of the following material is not an insulator. (a) wood (b) plastic (C) cotton (d) salt solution​

Answer 1

Answer:

all are insulator

Explanation:

Answer 2

Salt solution

Explanation:

The correct option for your question is Option-D, Salt Solution.

Let's take each options one by one.

Wood:

⇒Wood is a poor conductor of electricity and also heat.

⇒Movement of freely charged-ions does not takes place when electric current passes through it.

Plastics:

⇒Plastics are also bad conductor of electricity.

⇒In plastics too, Movement of free and drifting electrons, which are responsible for conduction are lesser in number.

Cotton:

⇒We know that air is a poor conductor of electricity.

⇒Cotton is loosely-packed and are so soft, as we usually know.

⇒Since the amount of air passes through cotton is higher, they do not conduct electricity.

Salt Solution:

⇒They are not insulators.

⇒In a salt solution, exchange of ions takes place.

For example, take the case of sodium and chloride. Sodium loses its electron and Chlorine gains electrons to attain stable electronic configuration.

⇒Since, the electrons are freely movable in a salt solution, it conducts electricity.

Know more:

Insulators:  Materials in which only less electric current is passed through them is called insulators.

Conductors: The materials in which more electric current is passed through them is called conductors.