Magnetic fields can be set up not only by permanent magnets, but also by electric currents. Let a piece of wire be arranged to pass vertically through a horizontal sheet of cardboard on which is placed some iron filings, as shown in Fig (a). If a current is now passed through the wire, then the
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From moderate to severe, sickle cell anemia symptoms might differ from person to person. While some individuals with sickle cell anemia may not show symptoms until later in life, others may have persistent and serious symptoms. The most common symptoms of sickle cell anemia include: Pain : Anywhere in the body can experience painful episodes,
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Sickle cell anemia is a hereditary condition that alters the structure of the body’s red blood cells. Red blood cells in people with sickle cell anemia have defective haemoglobin molecules, which gives the cells a crescent or sickle shape. These aberrant cells have the potential to lodge themselves in tiny blood vessels, restricting oxygen and
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There are several physical signs of stress, including: Muscle tension: Muscle tension brought on by stress can result in headaches, back or neck discomfort, and general body pains. Fatigue: Chronic stress can make you physically and mentally exhausted. People may experience fatigue, sluggishness, and low energy. Digestive problems: Digestive problems like stomach aches, bloating, constipation,
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(a) Capacitors connected in parallel Figure shows three capacitors, C1, C2 and C3, connected in parallel with a supply voltage V applied across the arrangement. When the charging current I reaches point A it divides, some flowing into C1, some flowing into C2 and some into C3. Hence the total charge QT ( = I ×
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Alternative energy refers to energy sources which could replace coal, traditional gas and oil, all of which increase the atmospheric carbon when burned as fuel. Renewable energy implies that it is derived from a source which is automatically replenished or one that is effectively infinite so that it is not depleted as it is used.
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The electromotive force (e.m.f.), E, of a cell is the p.d. between its terminals when it is not connected to a load (i.e. the cell is on ‘no load’). The e.m.f. of a cell is measured by using a high resistance voltmeter connected in parallel with the cell. The voltmeter must have a high resistance
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A meteorite is a solid chunk of space junk that crashes to the planet’s surface. It is a natural object that made it through the atmosphere of Earth and down to the earth. Depending on where in the solar system they came from, meteorites can have varied compositions since they are formed of different kinds
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The size, composition, speed, angle of entry, and location of the asteroid’s impact would all affect how it would affect Earth and how it would affect it. A small asteroid may harm the nearby area like a major explosion if it were to strike the Earth. The impact of the asteroid on a populated location
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Astronomers have been concerned about the near-Earth asteroid Apophis because it could collide with Earth. When the asteroid was found in 2004, there was considerable worry that it might hit the Earth in 2029. Even if later observations ruled out a direct collision in 2029, there is still a remote chance that one will occur
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