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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Case Study Questions for Class 9 Maths Chapter 6 Lines and Angles
Last modified on:3 years agoReading Time:2MinutesCase Study Questions for Class 9 Maths Chapter 6 Lines and Angles Here we are providing case study questions for Class 9 Maths Chapter 6 Lines and Angles. Students are suggested to solve the questions by themselves first and then check the answers. This will help students to check their grasp…
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Case Study Questions for Class 9 Maths Chapter 7 Triangles
Last modified on:3 years agoReading Time:6MinutesCase Study Questions for Class 9 Maths Chapter 7 Triangles Here we are providing case study questions for Class 9 Maths Chapter 7 Triangles. Students are suggested to solve the questions by themselves first and then check the answers. This will help students to check their grasp on this particular chapter…
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Important Derivations for Class 12 Physics Chapter 8 Electromagnetic Waves
Last modified on:3 years agoReading Time:6MinutesImportant Derivations for Class 12 Physics Chapter 8 Electromagnetic Waves (1) Derive expression for displacement current The electric flux between the plates of a capacitor is given by $$ \begin{aligned} & \phi_{\mathrm{E}}=\mathrm{EA}=\frac{\mathrm{Q}}{\varepsilon_0 \mathrm{~A}} \cdot \mathrm{A}=\frac{\mathrm{Q}}{\varepsilon_0} \\ & \quad \frac{\mathrm{d} \phi_{\mathrm{E}}}{\mathrm{dt}}=\frac{\mathrm{d}}{\mathrm{dt}}\left(\frac{\mathrm{Q}}{\varepsilon_0}\right)=\frac{1}{\varepsilon_0} \frac{\mathrm{dQ}}{\mathrm{dt}} \\ & \quad \frac{\mathrm{d} \phi_{\mathrm{E}}}{\mathrm{dt}}=\frac{1}{\varepsilon_0} \mathrm{i} \quad \quad\left(\text { As,…
