Chapter 20, Problem 25A

To determine

To Explain:The tiny paper pieces fly away after touching a charged comb.

Explanation of Solution

Introduction:

A body which has excess or deficit number of electrons as compared to number of protons is known as charged body. A body can be charged by mainly three methods:

1. Charging by conduction

2. Charging by induction

3. Charging by friction

When a neutral body is touched by a charged body, it is called charging by conduction. When a neutral object is brought near a charged body, the neutral body gets polarized and it is called charging by induction. When two neutral bodies having different electronegativities are rubbed against each other, one gets positively charged and other gets negatively charged.

Initially, tiny paper pieces are attracted towards the charged comb because of charging by induction. When comb touches the tiny pieces of paper, the charges are transferred to pieces of paper and because of same nature of charges, the pieces repel each other and thus fly off.