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Řøhăň Řąjpůť ✌️✊ 6 years, 3 months ago
꧁≪Mämƭå ℭℏᑌĎℎàℜÿ? 6 years, 3 months ago
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Posted by Nona Shrivastav 6 years, 3 months ago
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Gaurav Seth 6 years, 3 months ago
Eddy currents are the currents induced in the body of a conductor due to change in magnetic flux linked with the conductor.
Applications of eddy currents are:
a) Electromagnetic damping - Designing dead beat galvanometer
b) Induction furnace
c) Magnetic brakes
d) Electric power meters
e) Induction motor
To minimise eddy currents, the metal core to be used in an appliances like motor is taken in the form of thin sheets. Such a core is called laminated core. The planes of these sheets are arranged parallel to the magnetic field so that they cut across eddy current paths.Large resistance between the thin sheets confines the eddy current to the individual sheets. Hence eddy currents can be reduced to a large extent.
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Aayushi Narang 6 years, 3 months ago
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Tripti Rawat 6 years, 3 months ago
We know that volume V of gas is
- directly proportional to the quantity of gas i.e., number N of molecules contained in the gas. Mathematically,
{tex}V \propto N{/tex} (if P and T are constant) - inversely proportional to pressure P. Mathematically,
{tex}V \propto \frac{1}{P}{/tex} (if N and T are constant) - directly proportional to temperature T. Mathematically,
{tex}V \propto T{/tex} (if N and P are constant)
Combining all these, we have {tex}V \propto \frac{N T}{P}{/tex}
{tex}\therefore{/tex} {tex}\frac{P V}{N T}{/tex} = constant = kB = Boltzmann's constant
Generally, N is written as N = {tex}\mu N_A{/tex}, where NA is the number of molecules in one mole of gas and {tex}\mu{/tex} = quantity of gas in moles.
Hence, the above relation becomes
{tex}\frac{P V}{T}=N k_{B}{/tex} = {tex}\mu N_{A} k_{B}=\mu R{/tex}
Here R = {tex}\mu \cdot N_{A}{/tex} = gas constant for one mole of gas
or {tex}P V=\mu R T{/tex}
It is the ideal gas equation or equation of state for an ideal gas.
Yogita Ingle 6 years, 3 months ago
Ideal Gas Equation
- The gases following Boyle’s law, Charles’law and Avogadro law firmly are termed as anideal gas.
- From Boyle’s law we have V ∝ 1/p (Constant T, n)
- From Charles’ law we have V ∝ T (Constant p, n)
- From Avogadro’s law we have V ∝ n (Constant T, n)
- Combining them we get, V ∝ nT/p
- or V = nRT/p
pV = nRT ………………………… (IDEAL GAS EQUATION)
R =pV/nT
R= Gas Constant. It is same for all gases.
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Purva Bhardwaj 6 years, 3 months ago
Posted by Kaberi Datta 6 years, 3 months ago
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Yogita Ingle 6 years, 3 months ago
1. The first world people had to deal with threats of uncertain war and the weapons used in those war were so much devastating that it’s affect could be sensed even till now. Example the nuclear weapon used upon Heroshima and Nagasaki paralysed the people of Japan. Whereas the present third world people have lesser threat of war and with the norms like arms control prevent usage of nuclear weapon.
2. The first world people faced epidemics that killed lakhs of people whereas this kind of epidemics are preventable in the third world with so many preventable cure available in medical science
3. The major threat the people of third world faces is the environmental threat, the rise in global warming has increased the sea level that some islands faces the threat of being washed off. Whereas the first world people did not face such threat.
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Gaurav Seth 6 years, 3 months ago
Under the colonial rule, India was basically an agrarian economy employing nearly 85% of its population. Nevertheless, the growth of the agriculture sector was meager. This was due to the prevalence of various systems of Land Settlement, particularly Zamindari system. Under this system, the zamindars (owners of land) were required to pay very high revenue (lagaan) to the British government, which they used to collect from the peasants (landless labourers, who were actually cultivating). The zamindars were mainly concerned with extracting high revenues from the peasants but never took any steps to improve the productivity of the land. Moreover, in order to feed British industries with cheap raw materials, the Indian peasants were forced to grow cash crops (such as, indigo, cotton, etc.) instead of food crops (such as, rice and wheat). This commercialisation of agriculture not only increased the burden of high revenues on the poor peasants but also led India to face shortage of food grains. Therefore, Indian agriculture remained backward and primitive.
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Sia ? 6 years, 3 months ago
Compounds possessing hydroxyl and cyano groups on the same carbon atom are called cyanohydrins. These are produced by addition of HCN to aldehydes or ketones in weakly basic medium.
Cyanohydrins are useful synthetic reagents because they are used to prepare {tex}\alpha{/tex}-hydroxy acids. For example: conversion of acetaldehyde to lactic acid via acetaldehyde cyanohydrin
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Sia ? 6 years, 3 months ago
The Soviet Union lagged behind the West in technology, infrastructure (transport, power etc.) as it could not cope with the political and economic aspirations of people and resulted in:
The above-mentioned reasons made the Soviet economy stagnant.
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