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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Electric Field of a Line Charge
Last modified on:3 years agoReading Time:3MinutesElectric Field of a Line Charge Positive charge q is distributed uniformly along a line with length 2a, lying along the y-axis between y=–a and y=+a. We are here interested in finding the electric field at point P on the x-axis. Derivation of electric field due to a line charge: Thus,…
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Electric Field Lines
Last modified on:3 years agoReading Time:5MinutesElectric Field Lines Electric charges create an electric field in the space surrounding them. It is useful to have a kind of “map” that gives the direction and indicates the strength of the field at various places. Field lines, a concept introduced by Michael Faraday, provide us with an easy way…
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Human Ear
Last modified on:4 years agoReading Time:3MinutesHuman Ear The human ear, like that of other mammals, contains sense organs that serve two quite different functions: that of hearing and that of head and eye movements. Anatomically, the ear has three distinguishable parts: the outer, middle, and inner ear. How Human Ear Works? Different sounds produced in our surroundings are collected by…
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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…
