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 Biot-Savart Law for Class 12 Physics
Last modified on:4 weeks agoReading Time:9Minutes Numerical Problems on Biot-Savart Law Class 12 Physics · Moving Charges and Magnetism SQ Biot-Savart Law Practice Set Apply $d\vec{B} = \frac{\mu_0}{4\pi} \frac{I d\vec{l} \times \hat{r}}{r^2}$ Ch 4 · Moving Charges and Magnetism 1 A wire placed along east-west direction carries a current of 10 A from west to east…
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Numerical Problems Based on Kirchhoff’s Laws for Class 12 Physics
Last modified on:4 weeks agoReading Time:10Minutes Numerical Problems on Kirchhoff’s Laws Class 12 Physics · Current Electricity SQ Kirchhoff’s Circuit Laws Practice Set Apply KCL $\sum I = 0$ and KVL $\sum \Delta V = 0$ Ch 3 · Current Electricity 1 Apply Kirchhoff’s rules to the loops PRSP and PRQP to write the expressions for…
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Numerical Problems Based on Heating Effects of Electric Current for Class 12 Physics
Last modified on:4 weeks agoReading Time:24Minutes Numerical Problems on Heating Effects of Electric Current Class 12 Physics · Current Electricity SQ Electric Power and Heating Effects Practice Set Apply $H = I^2Rt$, $P = VI$, and $P = \frac{V^2}{R}$ Ch 3 · Current Electricity 1 Calculate the current flowing through a heater rated at 2 kW…
