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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Electric Field of a Line Charge
Last modified on:3 years agoReading Time:3MinutesElectric Field of a Line Charge Positive charge q is distributed uniformly along a line with length 2a, lying along the y-axis between y=–a and y=+a. We are here interested in finding the electric field at point P on the x-axis. Derivation of electric field due to a line charge: Thus,…
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Electric Field Lines
Last modified on:3 years agoReading Time:5MinutesElectric Field Lines Electric charges create an electric field in the space surrounding them. It is useful to have a kind of “map” that gives the direction and indicates the strength of the field at various places. Field lines, a concept introduced by Michael Faraday, provide us with an easy way…
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Human Ear
Last modified on:5 years agoReading Time:3MinutesHuman Ear The human ear, like that of other mammals, contains sense organs that serve two quite different functions: that of hearing and that of head and eye movements. Anatomically, the ear has three distinguishable parts: the outer, middle, and inner ear. How Human Ear Works? Different sounds produced in our surroundings are collected by…
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Physics MCQs for Class 12 Chapter 7 Alternating Current with Answers
Last modified on:5 years agoReading Time:28MinutesMCQs based on Alternating Current: Q.1. In general in an alternating current circuit(a) the average value of current is zero(b) the average value of square of the current is zero(c) average power dissipation is zero(d) the phase difference between voltage and current is zero Answer Answer: (a) Q.2. The frequency of…
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Revision Notes For Class 12 Physics Chapter 6 Electromagnetic Induction
Last modified on:5 years agoReading Time:20MinutesMagnetic flux : The number of magnetic lines of force crossing a surface is known as magnetic flux linked with that surface. It is given by, Φ= B. A = BA cosθ, where B is the strength of magnetic field, A is the area of surface and θ is the angle…
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Lami’s Theorem MCQ for NEET
Last modified on:5 years agoReading Time:7MinutesQ.1. Which of the following is true about Lami’s theorem?(a) The theorem is derived based on the cosine rule of trigonometry(b) The theorem is only applicable to regular shaped bodies in equilibrium(c) The theorem is helpful in determining the unknown forces acting at a point for an object in equilibrium.(d) The…
