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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CBSE Class 9 Science Important Question Chapter 9 Force and Laws of Motion
Last modified on:5 years agoReading Time:12Minutes Very Short Answer Questions (1 Marks) Part-1 Q.1. State Newton’s first law of motion. Q.2. An athelete always runs some distance before taking a jump. Why? Q.3. Define 1 kg weight and express it in newton. Q.4. What is the mass of an object whose weight is 196 N? Q.5. Two similar…
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CBSE Class 9 Science Revision Notes Chapter 9 Force and Laws of Motion
Last modified on:5 years agoReading Time:8Minutes1. Force, generally denotes push or pull. 2. Force, is defined as an external agent which changes or tends to change the state of rest or uniform motion of the body or changes the direction of the body or deforms the body. 3. Effects of force :(i) A force can produce…
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Class 9 Science Work & Energy (Questions from board papers)
Last modified on:5 years agoReading Time:25MinutesScience Chapter-11 Work and Energy (Questions from Board Papers) Question 1: Identify and state the type of transformation of energy in the following cases: (a) When coal is burnt. (b) In a thermal power plant [CBSE 2014] Answer 1: (a) Chemical energy…
