0

Guest

Courses New

When we rub comb on hair it became charged then after sometime it is not charged where does charge moves ?

When we rub comb on hair it became charged then after sometime it is not charged where does charge moves ?

Grade:11

2 Answers

Arun
25750 Points
4 years ago
When you rub plastic comb on dry hair, some electrons jump from comb to hair leaving the comb charged (Why? Another story some other day). Now when you bring the comb near the bits of pieces of paper it polarizes the paper.
Polarizes? what does it mean. It means the positive charge on the comb attracts the electrons of the electrically neutral paper and brings the electrons nearer to the comb. That means the other end develops equal positive charge. This is the polarization phenomena in which the charges get separated.
Now how does it attracts the electrically neutral bits of paper? ( yes it is still electrically neutral!!! only it has got polarized). Apply coulomb’s law i.e force inversely proportional to r square. That means the attractive forces are higher than the repulsive forces.(q1 and q2 are same but r is different). That means there is a net attractive force on the pieces of paper.
 
Vikas TU
14149 Points
4 years ago
Dear student 
When 2 suitable bodies are rubbed, they become oppositely charged due to the transfer of electrons from one body to other. The changes remains with the bodies and so the electricity is called static electricity. As they become oppositely charged they get a tendency to attract each other. Dat is why, a plastic comb attract piece of paper when rubbed in dry hair
Good Luck 

Think You Can Provide A Better Answer ?

Other Related Questions on Modern Physics

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More