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 Alternating Current
Last modified on:4 years agoReading Time:11MinutesConceptual Questions Based on Alternating Current Q.1. Why a d.c. voltmeter and d.c. ammeter cannot read a.c.? Solution. The average value of a.c. over a cycle is zero. So, a d.c. voltmeter/ammeter will show zero reading with alternating voltage/current. Q.2. What is meant by the statement that the current through an…
-
Conceptual Questions Based on Electromagnetic Induction
Last modified on:4 years agoReading Time:7MinutesQ.1. Will an induced emf develop in a conductor, when moved in a direction parallel to the magnetic field ? Solution. No, because the magnetic flux linked with the conductor does not change when it is moved parallel to the magnetic field. Moreover, the magnetic Lorentz force on the free electrons…
-
Conceptual Questions Based on Moving Charges and Magnetism
Last modified on:3 years agoReading Time:16MinutesConceptual Questions Based on Moving Charges and Magnetism Here we are providing conceptual questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism. Q.1. How is a magnetic field produced ?Sol. A magnetic field can be produced by the following ways: (i) by a magnet (ii) by a current carrying…
