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Gaurav Seth 7 years, 2 months ago
After 1601, when British East India company wanted to explore India, the major trading was from Portugal.
This company was based in Bombay, Cochin and tried exploring Daman Diu.
England and Portugal had treaties of friendship and peace from 1496.
There was an agreement that British East India company will not encroach on the interests of the Portuguese.
They chose Calcutta as natural harbor and the company set Calcutta as the headquarters.
Posted by Priti Nikshe 7 years, 2 months ago
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Drishti Jain 7 years, 2 months ago
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Sia ? 6 years, 8 months ago
The irrational numbers are all the real numbers which are not rational numbers, the latter being the numbers constructed from ratios of integers.
Posted by Ishu Aakash 7 years, 2 months ago
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Meghna Thapar 5 years, 9 months ago
- Sound plays an important role in our life. It helps us to communicate with one another.
- Sound is produced by a vibrating body.
- The sensation felt by our ears is called sound.
- Sound is produced by the vibration of vocal cords in humans.
- Sound needs a medium for propagation.
- The sound cannot travel through vacuum.
- Amplitude and frequency are two important properties of any sound.
- Sound produced by a harmonium or a sitar is a musical sound.
Posted by Rajkumar Das 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
- Electromagnetic waves are nothing but changing magnetic and electric fields.
- Electromagnetic waves are solutions of Maxwell’s equations, which are the fundamental equations of electrodynamics. He described that the magnetic field can be produced by changing electric field.
A fundamental force in nature, the electromagnetic force acts between charged particles and is the combination of all electrical and magnetic forces. The electromagnetic force can be attractive or repulsive. It has infinite range, although its strength is inversely proportional to the inverse square of the distance (that is, doubling the distance between two charged particles decreases the force between them by a factor of four). Aside from gravity, the electromagnetic force is responsible for all forces we experience directly (the only other two known fundamental forces are the "strong force" and the "weak force," which hold together the particles in the nucleus of an atom). For example, the electromagnetic force holds atoms together in molecules, causes friction, and attracts iron to a magnet.
Posted by Ansh Khodre 7 years, 2 months ago
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Posted by Swayam Shree Sahu 7 years, 2 months ago
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Gaurav Seth 7 years, 2 months ago
- During a thunderstorm, the air currents move upward and water droplets move downward. These movements take at very fast pace and it results in separation of charges in the clouds.
- The positive charges accumulate at the upper edges of the clouds and the negative charges accumulate at the lower edges of the clouds. Scientists are yet to understand the exact reason for this.
- At the same time, the ground becomes positively charged.
- Air is a bad conductor of electricity under normal circumstances. But when the amount of charge becomes too much in the clouds, the air is not in a position to hold on to this charge. As a result, the electric charge is transferred to the ground. This appears like a bright streak of light across the sky; which lasts for a few seconds.
Posted by Harsh Raj 7 years, 2 months ago
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Posted by Diksha Sharma 7 years, 2 months ago
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Meghna Thapar 5 years, 9 months ago
There are four major types (or “ranks”) of coal. Rank refers to steps in a slow, natural process called “coalification,” during which buried plant matter changes into an ever denser, drier, more carbon rich, and harder material. The four ranks are:
- Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter.
- Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite. Bituminous usually has a high heating (Btu) value and is the most common type of coal used in electricity generation in the United States. Bituminous coal appears shiny and smooth when you first see it, but look closer and you may see it has layers.
- Subbituminous: Subbituminous coal is black in color and dull (not shiny), and has a higher heating value than lignite.
- Lignite: Lignite coal, aka brown coal, is the lowest grade coal with the least concentration of carbon.
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