when a comb is passed through a dry hair it attracts some bits of paper.why?what if the comb is passed through a wet hair?
when a comb is passed through a dry hair it attracts some bits of paper.why?what if the comb is passed through a wet hair?
Hello!The attraction of the bits of paper to the comb is due to the phenomena known as static electricity.
When we run comb through dry hair repeatedly, due to friction, the loosely held electrons in our hair are transferred to the comb. Buildup of static charge takes place. So, hair becomes positively charged and the comb acquires a negative charge. This negatively charged comb can now attract objects that carry an excess of positive charge in them, like bits of paper or dust particles.
This only works with dry hair as wet hair has a coating of water (or any other liquid) on them. This reduces the friction between the hair and comb (when we run it through) and as a result no electron flow takes place. Thus no static charges develop. The comb would never get negatively charged and consequently wouldn't attract any paper bits etc.
Hello!The attraction of the bits of paper to the comb is due to the phenomena known as static electricity.
When we run comb through dry hair repeatedly, due to friction, the loosely held electrons in our hair are transferred to the comb. Buildup of static charge takes place. So, hair becomes positively charged and the comb acquires a negative charge. This negatively charged comb can now attract objects that carry an excess of positive charge in them, like bits of paper or dust particles.
This only works with dry hair as wet hair has a coating of water (or any other liquid) on them. This reduces the friction between the hair and comb (when we run it through) and as a result no electron flow takes place. Thus no static charges develop. The comb would never get negatively charged and consequently wouldn't attract any paper bits etc.
