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Attraction & repulsion of atom:
It can be observed, that if two negatively charged bodies are brought together, there is a force of repulsion between them. Similarly if two positively charged bodies are brought together there is a force of repulsion. However, if a positively charged body is brought close to a negatively charged body, they attract each other. Hence:
Like Charges Repel, Unlike Charges Attract.
The force of attraction or repulsion is governed by an inverse square lawUNIT OF CHARGE
The charge on an electron is very small, therefore a more practical unit of charge called a Coulomb, has been chosen:
One Coulomb = 6.29 x 1018 electrons
Define, with the help of diagram, the principle and working of an a.c. Generator. Write the expression for the e.m.f. generated in the coil in terms of its speed of rotation
At what velocity a clock should move so that it seems slow by one minute in a day.
CONSERVATION OF ENERGY 1. Potential energy is, as the word suggests, the energy "locked up" up somewhere and which can perform work. Potential energy Potential energy can b
An ore sample weighs 17.50 N in air. When the sample is suspended by a light cord and totally immersed in water, the tension in the cord is 11.20 N. Find the total volume and the d
Watt; W (after J. Watt, 1736-1819): The derived SI unit of power, explained as a power of 1 J acting onto a period of 1 s; thus it has units of J/s.
Nuclear Reactor: During fission large amount of energy is free in the form of heat. A system, which is used to get controlled amount of heat energy from nuclear fission is know
Disadvantages of A.C. Transmission of power 1. An a.c. line needs more copper than a d.c. line. 2. The construction of an a.c. transmission line is more complex than d.c. tr
In two-dimension motion a body go in a plane. e.g. a particle rolling in a circle, a cricket ball caught by a fielder. In the first case the body can go round with a fix velocity o
Diagram of the network looks: (b) When both x and y are large, i.e., both A and B are firing, w is increasing without bound. When one or both of x and y are small, w does n
A device which changes light energy into electrical energy is known as photoelectric cell. It is also known as photocell or electric eye.
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