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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Important Derivations for Class 12 Physics Chapter 3 Current Electricity
Last modified on:3 years agoReading Time:20MinutesImportant Derivations for Class 12 Physics Chapter 3 Current Electricity Deduction of Ohm’s law. When a potential difference ‘V’ is applied across a conductor of length ‘l’, the drift velocity in terms of ‘V’ is given by $$ v_d=\frac{e E \tau}{m}=\frac{e V \tau}{m l} $$ If the area of cross-section of…
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Important Derivations for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance
Last modified on:3 years agoReading Time:9MinutesImportant Derivations for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance Derivations Related to Potential due to an Electric Dipole Derivation 1: Electric potential due to electric dipole at a point on its axial line. Solution: Let ‘P’ be an axial point at distance ‘r’ from the centre of the…
