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: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…
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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…
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Numerical Problems Based on Motion under Gravity for Class 11 Physics
Last modified on:5 months agoReading Time:16Minutes Numerical Problems on Motion Under Gravity Class 11 Physics · Motion in a Straight Line SQ Free Fall and Vertical Motion Practice Set Apply equations of motion with constant acceleration $g$ Ch 3 · Motion in a Straight Line 1 A stone is thrown vertically upwards with a velocity of…
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Numerical Problems Based on Motion with Uniform Acceleration for Class 11 Physics
Last modified on:5 months agoReading Time:16Minutes Numerical Problems on Kinematics (Equations of Motion) Class 11 Physics · Motion in a Straight Line SQ Equations of Uniformly Accelerated Motion Apply $v = u + at$, $s = ut + \frac{1}{2}at^2$, and $v^2 – u^2 = 2as$ Ch 3 · Motion in a Straight Line 1 A race…
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Numerical Problems Based on Instantaneous Velocity and Instantaneous Acceleration for Class 11 Physics
Last modified on:5 months agoReading Time:8Minutes Numerical Problems on Kinematics (Calculus Method) Class 11 Physics · Motion in a Straight Line SQ Differentiation in Kinematics Practice Set Apply the concepts of $v = \frac{dx}{dt}$ and $a = \frac{dv}{dt}$ Ch 3 · Motion in a Straight Line 1 The displacement $x$ of a particle at time $t$…
