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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Conductors and Insulators
Last modified on:4 years agoReading Time:2MinutesConductors and Insulators Solids are mainly classified into two groups, conductors and insulators. In conductors, electric charges are free to move from one place to another, whereas in insulators they are tightly bound to their respective atoms. In an uncharged body, there are equal number of positive and negative charges. The…
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Electric Field Due to a Point Charge
Last modified on:3 years agoReading Time:1MinuteElectric Field Due to a Point Charge The electric field produced by a point charge q can be obtained in general terms from Coulomb’s law.First note that the magnitude of the force exerted by the charge q on a test charge q0 is then divide this value by q0 to obtain…
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Electric Field Due to a Charged Ring
Last modified on:3 years agoReading Time:4MinutesElectric Field Due to a Charged Ring A conducting ring of radius R has a total charge q uniformly distributed over its circumference. We are interested in finding the electric field at point P that lies on the axis of the ring at a distance x from its centre. We divide…
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Physics MCQs for Class 12 Chapter 9 Ray Optics and Optical Instruments
Last modified on:2 years agoReading Time:10MinutesPhysics MCQs for Class 12 Chapter 9 Ray Optics and Optical Instruments Here we are providing MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instrument. Q.1. Which of the following colour of white light deviated most when passes through a prism?(a) Red light(b) Violet light(c) Yellow light(d)…
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Physics MCQs for Class 12 Chapter 8 Electromagnetic Waves
Last modified on:4 years agoReading Time:36MinutesMCQs on Class 12 Physics Chapter 8 Electromagnetic Waves Q.1. In electromagnetic waves the phase difference between electric and magnetic field vectors are(a) zero(b) 𝜋/4(c) 𝜋/2(d) π Answer Answer: (a) Electric and magnetic field vectors always vary in same phase. Q.2. Which of the following has minimum wavelength? (a) Blue light(b) γ-rays(c) infrared…
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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…
