Table of Contents
Charging of Insulators
Since charge cannot flow through insulators, neither conduction nor induction can be used to charge, insulators, so in order to charge an insulator friction is used. Whenever an insulator is rubbed against a body exchange of electrons takes place between the two. This results in appearance of equal and opposite charges on the insulator and the other body. Thus the insulator is charged.
For example rubbing of plastic with fur, silk with glass causes charging of these things.
-
COULOMB’S LAW
Last modified on:3 years agoReading Time:18MinutesCOULOMB’S LAW: Two point electric charges q1 and q2 at rest, separated by a distance r exert a force on each other whose magnitude is given by If between the two charges there is free space then Where ε0 is the absolute electric permittivity of the free space and ε0 =…
-
If we comb our hair on a dry day and bring the comb near small pieces of paper, the comb attracts the pieces, why?
Last modified on:4 years agoReading Time:2Minutes 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…
-
Can two similarly charged bodies attract each other?
Last modified on:4 years agoReading Time:1Minute Yes, when the charge on one body Q is much greater than that on the other q and they are close enough to each other so that force of attraction between Q and induced charge on the other exceeds the force of repulsion between Q and q. However, two similar…
-
Physics VSQs for Class 11 with Answers Chapter 11 Thermal Properties of Matter
Last modified on:5 years agoReading Time:9MinutesQ.1. What do you mean by triple point ? Answer Answer: It is a particular point in the phase diagram, representing a particular pressure and temperature at which a substance can coexist in all three phases in solid, liquid and gas. Q.2. Why the triple point of water is considered as…
-
Physics VSQs for Class 11 with Answers Chapter 9 Elasticity
Last modified on:5 years agoReading Time:7MinutesQ.1. Why do a spring balance show wrong measure after long use? Answer Answer: After long use the spring gradually loses its elastic nature and doesn’t come back to its initial configuration completely after the weight is withdrawn. Q.2. Which is more elastic water or air and why? Answer Answer: Water…
-
Physics VSQs for Class 11 with Answers Chapter 15 Waves
Last modified on:5 years agoReading Time:10MinutesQ.1. What type of mechanical wave exists in air and inside water? Answer Answer: Longitudinal waves exist in both air and inside the water. Q.2. What is the phase difference between the wave y = a cos(wt + kx) and y = a sin (wt + kx)? Answer Answer: Phase difference…
