Question

3. In a plastic comb, electric charges cannot
spread throughout the body since it is a _______​

Answer 1

In a plastic comb, electric charges cannot spread throughout the body since it is a non-conductor .

Explanation :-

It gets electrically charged due to friction and not because of its conductive nature.

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More Information -

We rub a plastic comb with our dry hair and bring it near tiny pieces of paper. We will find that the comb attracts the tiny pieces of paper towards itself. Due to this attraction, the tiny pieces of paper move towards the comb and stick to it. Actually, when we rub the plastic comb with our dry hair, the plastic comb gets electric charge due to friction. The electrically charged comb then exerts an electric force on the tiny pieces of paper and attracts them.

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This phenomenon happens because of the static electricity.

Sᴛᴀᴛɪᴄ Eʟᴇᴄᴛʀɪᴄɪᴛʏ -

• All atoms have a nucleus which contains protons and neutrons. The nucleus is held together by a very strong force, which means that the protons within a nucleus can be considered to be fixed there. The atom also contains electrons. Where are the electrons arranged in the atom?

• The atom is held together by the electrostatic attractionbetween the positively charged nucleus and the negatively charged electrons. Within an atom, the electrons closest to the nucleus are the most strongly held, whilst those further away experience a weaker attraction.

• Normally, atoms contain the same number of protons and electrons. This means that atoms are normally neutral because they have the same number of positive charges as negative charges, so the charges balance each other out. All objects are made up of atoms and since atoms are normally neutral, objects are also usually neutral.

• However, when we rub two surfaces together, like when you comb your hair or rub a balloon against your hair, the friction can cause electrons to be transferred from one object to another.

• Remember, the protons are fixed in place in the nucleus and so they cannot be transferred between atoms, it is only electrons that are able to be transferred to another surface. Some objects give up electrons more easily than other objects.

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Answer 2

Answer:

When a comb is run through dry hair, the comb gets negatively charged due to friction.when the negatively charged comb is brought near a small bit of paper,the electron on the paper are repelled and positive charge will be nearer to the comb.therefore there is a force of attraction between the comb and the small bits of paper.if the hair is wet ,friction between comb and hair is greately reduced.consequently the comb is charged to a lesser extent and it may not attract the small bits of paper. The same is true if it is a rainy day ,because due to higher humidity the hair doesn't remain perfectly dry.