Explain what is observed :- electric current is passed through a colloidal sol?

Explain what is observed :- when a beam of light is passed through a colloidal sol.

Explain what is observed when abeam of light is passed through colloidal solution of arsenious sulphide? Give the name of the phenomenon also.

What is meant by electric current?

What is electric current?

Colloidal sol is :

Do all liquids allow electric current to pass through them?