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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Reynolds Number
Last modified on:3 years agoReading Time:10MinutesWhat is Reynolds Number? The Reynolds number (Re) is a dimensionless parameter used in fluid mechanics to characterize the flow of a fluid (liquid or gas) around an object or through a conduit. It relates the inertial forces to the viscous forces in the fluid and helps determine the type of…
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Numerical Problems Based on Temperature Variation of Resistance for Class 12 Physics
Last modified on:1 month 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:1 month 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:1 month 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…
