Question

A plastic comb when rubbed with dry hair gets charged. However a mettalic comb does not. Give reason????

Answer 1

A plastic comb when rubbed with dry hair gets charged. This is because the electrons present in our hair particles move to the comb and the comb has excessive negative charge which means that the comb has net negative charge.
The charge remains static as there is no conducting medium for it to move.

A metallic comb does not get charged. This is because metals are good conductor of electricity. When the metal comb is rubbed against hair , electrons transfer from the hair to comb but as soon as it enters the comb , as the comb is a conductor , it further conducts this charge to our body and then to the charge gets transferred to earth.

Answer 2

When dry hair is brushed with a plastic comb, the hair becomes positively charged due to friction.

Electrostatics:

• The behaviors and features of stationary or slow-moving electric charges are studied in electrostatics, a field of physics.
• Coulomb's law describes electrostatic events, which are caused by the forces that electric charges exert on each other.
• The study of electric charges at rest is electrostatics, a branch of physics.
• Some materials, such as amber, have been known to attract lightweight particles after rubbing since classical times.
• The electrostatic force occurs between electrically charged particles or things that are at rest.
• Electrostatic forces can be seen in the following examples: When we use a comb to run a piece of paper through the oil in our heads, we create electrostatic force.

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