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:5 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:5 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…
-
NEET DPP Biology Ch-24 Sexual Reproduction In Flowering Plants
Last modified on:5 years agoReading Time:27MinutesQ.1. Entry of pollen tube through micropyle is(a) Chalazogamy (b) Mesogamy(c) Porogamy (d) Pseudogamy Answer Answer: (c) In porogamy the tip of pollen tube enters the micropyle, pushes through the nucellar tissue & finally pierces the eggapparatus end of the embryo sac. If pollen tube enters through the chalazal side it…
-
Physics MCQs for Class 12 with Answers Chapter 3 Current Electricity
Last modified on:1 year agoReading Time:32MinutesMCQs based on Current Electricity: Q.1. In a current carrying conductor the net charge is(a) 1.6 x 10–19 coulomb (b) 6.25 x 10–18 coulomb(c) zero (d) infinite Answer Answer: (c) Explanation: In a current carrying conductor, the net charge is zero. Q.2. The current which is assumed to be flowing in…
-
MCQ Questions on Refraction of Light for Class 10 Science
Last modified on:4 years agoReading Time:15Minutes Question 1:Four students showed the following traces of the path of a ray of light passing through a rectangular glass slab.The trace most likely to be correct is that of student:(a) I (b) II (c) III …
