Table of Contents
If we comb our hair on a dry day and bring the comb near small pieces of paper, the comb attracts the pieces, why?
Answer: This is an example of frictional electricity and induction. When we comb our hair, it gets positively charged by rubbing. When the comb is brought near the pieces of paper some of the electrons accumulate at the edge of the paper piece which is closer to the comb. At the farther end of the piece there is deficiency of electrons and hence, positive charge appears there. Such a redistribution of charge in a material, due to presence of a nearby charged body is called induction. The comb exerts larger attraction on the negative charges of the paper piece as compared to the repulsion on the positive charge. This is because the negative charges are closer to the comb. Hence, there is a net attraction between the comb and the paper piece.
You may also like
-
Conceptual Questions Based on Class 12 Physics Dual Nature of Radiation and Matter
Last modified on:3 years agoReading Time:6MinutesConceptual Questions Based on Class 12 Physics Dual Nature of Radiation and Matter Q.1. What happens to the wavelength of a photon after it collides with an electron? Solution. A photon transfers a part of its energy to the colliding electron, so its energy decreases and consequently wavelength increases. Q.2. Why…
-
Conceptual Questions Based on Class 12 Physics Wave Optics
Last modified on:3 years agoReading Time:8MinutesConceptual Questions Based on Class 12 Physics Wave Optics Here we are providing conceptual questions based on Class 12 Physics Wave Optics. Go through each and every question for better understanding. Q.1. What are the reasons to believe that light is a wave motion? Solution. Light undergoes interference, diffraction and polarization.…
-
Conceptual Questions Based on Class 12 Physics Optical Instruments
Last modified on:3 years agoReading Time:10MinutesConceptual Questions Based on Class 12 Physics Optical Instruments Here we are providing conceptual questions based on class 12 physics chapter 9 Optical Instruments. These questions are prepared by experts and are very useful from exam point of view. Students can practice these questions for scoring better marks in the exam.…
