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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Charging of Insulators
Last modified on:4 years agoReading Time:2Minutes 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…
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Charging by Contact
Last modified on:4 years agoReading Time:2Minutes Charging by Contact When a negatively charged ebonite rod is rubbed on a metal object, such as a sphere, some of the excess electrons from the rod are transferred to the sphere. Once the electrons are on the metal sphere, where they can move readily, they repel one another and…
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Charging by Rubbing
Last modified on:4 years agoReading Time:3Minutes Charging by Rubbing The simplest way to charge certain bodies is to rub them against each other. When a glass rod is rubbed with a silk cloth, the glass rod acquires some positive charge and the silk cloth acquires negative charge by the same amount. The explanation of appearance of…
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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…
