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 with Answers Chapter 10 Wave Optics
Last modified on:5 years agoReading Time:31MinutesQ.1. The locus of all particles in a medium, vibrating in the same phase is called(a) wavelet(b) fringe(c) wave front(d) None of these Answer Answer: (c) Q.2. Which of the following is correct for light diverging from a point source?(a) The intensity decreases in proportion for the distance squared.(b) The wavefront…
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Physics MCQs for Class 12 with Answers Chapter 11 Dual Nature of Matter and Radiation
Last modified on:5 years agoReading Time:24MinutesQ.1. Cathode ray consists of(a) photons (b) electrons(c) protons (d) α-particles Answer Answer: (b) Cathode ray consists of electrons Q.2. A discharge takes place between the two electrodes on applying the electric field to the gas in the discharge tube. The cause of this fluorescence was attributed to(a) the radiations which…
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Physics MCQs for Class 12 with Answers Chapter 12 Atoms
Last modified on:5 years agoReading Time:27MinutesQ.1. Balmer series lies in which spectrum?(a) visible(b) ultraviolet(c) infrared(d) partially visible, partially infrared Answer Answer: (b) Q.2. In Bohr model of hydrogen atom, let P.E. represents potential energy and T.E. represents the total energy. In going to a higher level.(a) P. E. decreases, T.E. increases(b) P. E. increases, T.E. decreases(c)…
