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.
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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 =…
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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…
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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…
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Numerical Problems Based on Conservation of Linear Momentum for Class 11 Physics
Last modified on:4 months agoReading Time:12Minutes Numerical Problems Based on Conservation of Linear Momentum for Class 11 Physics Numerical Problems on Newton’s Laws of Motion Class 11 Physics · Laws of Motion SQ Conservation of Momentum Practice Set Apply Law of Conservation of Linear Momentum ($m_1u_1 + m_2u_2 = m_1v_1 + m_2v_2$) Ch 5 · Laws…
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Numerical Problems Based on Newtons Third Law and Motion in a Lift for Class 11 Physics
Last modified on:4 months agoReading Time:14Minutes Numerical Problems Based on Newtons Third Law and Motion in a Lift for Class 11 Physics Numerical Problems on Newton’s Third Laws of Motion Class 11 Physics · Laws of Motion SQ Motion in a Lift & Apparent Weight Apply $T – mg = ma$ and $mg – T =…
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Numerical Problems Based on Impulse of a Force for Class 11 Physics
Last modified on:4 months agoReading Time:12Minutes Numerical Problems Based on Impulse of a Force for Class 11 Physics Numerical Problems on Impulse of a Force Class 11 Physics · Laws of Motion SQ Impulse and Momentum Practice Set Apply Impulse-Momentum theorem and Kinematics Ch 5 · Laws of Motion 1 A cricket ball of mass 150…
