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
COULOMB’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 = 8.85 x 1012 C2 … Continue reading COULOMB’S LAW

If we comb our hair on a dry day and bring the comb near small pieces of paper, the comb attracts the pieces, why?
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 … Continue reading If we comb our hair on a dry day and bring the comb near small pieces of paper, the comb attracts the pieces, why?

Can two similarly charged bodies attract each other?
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 point charges can never attract … Continue reading Can two similarly charged bodies attract each other?

Class 10 Maths PPT for Online Teaching
Class 10 Maths PPT for Online Teaching We are providing class 10th Maths PPTs. Make your online teaching interesting with our interactive highly animated PowerPoint presentations for Maths. A must buy for teachers teaching online. Get PowerPoint presentations for complete class 10 Maths. These PPTs are very useful for teaching purpose. These Maths PPTs based … Continue reading Class 10 Maths PPT for Online Teaching

Revision Notes for Class 12 Physics Chapter 10 Wave Optics
Wavefront : The locus of all particles of the medium vibrating in the same phase at a given instant is known as wavefront.Depending on the shape of sources of light, wavefront can be of three types>> Spherical wavefront : When the source of light is a point source, the wavefront is spherical.>> Cylindrical wavefront : … Continue reading Revision Notes for Class 12 Physics Chapter 10 Wave Optics