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 Energy in Capacitors for Class 12 Physics
Last modified on:3 years agoReading Time:9MinutesNumerical Problems Based on Energy in Capacitors for Class 12 Physics Q.1. A battery of 10 V is connected to a capacitor of capacity 0.1 F. The battery is now removed and this capacitor is connected to a second uncharged capacitor. If the charge distributes equally on these two capacitors, find…
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Numerical Problems Based on Grouping of Capacitors for Class 12 Physics
Last modified on:3 years agoReading Time:8MinutesNumerical Problems Based on Grouping of Capacitors for Class 12 Physics Q.1. Two capacitors have a capacitance of 5μF when connected in parallel and 1.2 μF when connected in series. Calculate their capacitances. (Ans. 2 μF and 3 μF) Q.2. Calculate the charge supplied by the battery in the arrangement shown…
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Numerical Problems Based on Capacitance of Capacitors for Class 12 Physics
Last modified on:3 years agoReading Time:8MinutesNumerical Problems Based on Capacitance of Capacitors for Class 12 Physics Q.1. Two metallic conductors have net charges of + 70 pC and – 70 pC, which result in a potential difference of 20 V between them. What is the capacitance of the system? (Ans. 3.5 pF) Q.2. A spherical capacitor…
