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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Numerical Problems Based on Temperature Variation of Resistance for Class 12 Physics
Last modified on:4 weeks agoReading Time:12Minutes Numerical Problems on Temperature Variation of Resistance Class 12 Physics · Current Electricity SQ Temperature Coefficient Practice Set Apply $R_t = R_0(1 + \alpha \Delta t)$ Ch 3 · Current Electricity 1 A platinum wire has a resistance of $10 \Omega$ at $0^{\circ}\text{C}$ and of $20 \Omega$ at $273^{\circ}\text{C}$. Find…
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Numerical Problems Based on Mobility of Charge Carriers for Class 12 Physics
Last modified on:4 weeks agoReading Time:6Minutes Numerical Problems on Mobility of Charge Carriers Class 12 Physics · Current Electricity SQ Mobility and Conductivity Practice Set Apply $\mu = \frac{v_d}{E}$ and $\sigma = ne\mu$ Ch 3 · Current Electricity 1 A potential difference of 4.5 V is applied across a conductor of length 0.1 m. If the…
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Numerical Problems Based on Drift Velocity for Class 12 Physics
Last modified on:4 weeks agoReading Time:21Minutes Numerical Problems on Drift Velocity and Current Class 12 Physics · Current Electricity SQ Drift Velocity and Electric Current Practice Set Apply $I = nAev_d$ and relation with current density Ch 3 · Current Electricity 1 The free electrons of a copper wire of cross-sectional area $10^{-6}\text{ m}^2$ acquire a…
