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What is the force between two small charged spheres having charges of 2 × 10−7 C and 3 × 10−7 C placed 30 cm apart in air?

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Ques : What is the force between two small charged spheres having charges of 2 × 10−7 C and 3 × 10−7 C placed 30 cm apart in air? Ans : Repulsive force of magnitude 6 × 10−3 N   Charge on the first sphere, q1 = 2 × 10−7 C   Charge on the second sphere, q2 = 3 × 10−7 C   Distance between the spheres, r = 30 cm = 0.3 m Electrostatic force between the spheres is given by the relation   where, 𝜀0 = Permittivity of free space and 1/ 4𝜋𝜀 = 9 × 10^9 Nm² C −2  Therefore, force   Hence, force between the two small charged spheres is 6 × 10−3 N.  The charges are of same nature. Hence, force between them will be repulsive.
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Yoga & Lifestyle CHAPTER 3 class 12 NOTES || Meaning of asana || Asanas as preventive measure || Procedure, benefits and contraindications for Vajrasana padahastasana Ardh Matseyendrasana Trikonasana Trikonasana Bhujangasana Shalabhasana Tadasana ||

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                                                  CHAPTER - 3                           YOGA AND LIFESTYLE Meaning of asana   To sit in a comfortable position for everlasting period of time is called asana.  Asanas as preventive measure Asana can be preventive measures as they provide following physiological benefits which ultimately helps in avoiding various lifestyle disease. The following are the benefits of asana for prevention of diseases :  a) Bones and joints become strong : By performing regular asana, the bones, cartilages, and ligaments become strong. Along with this, height of children is enhanced .  b) Circulation of blood becomes normal : By performing asana regularly, the stroke volume as well as cardiac output increases because cardiac muscles start working ...
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SPORTS AND NUTRITION chapter 2 class 12 notes || Balanced diet || Components of Diet (Nutrients) || Eating for weight control || Food myths || PITFALL OF DIETING || Sports Nutrition (Fluid & Meal in take, pre, during the post Competition)

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                             CHAPTER - 2               SPORTS AND NUTRITION Key Points :   ●  Balanced Diet and Nutrition: Macro and Micro Nutrients.  ●  Nutritive and Non-nutritive components of diet  ●  Eating for weight control - A healthy weight, the Pitfall of dieting, Food Intolerance and Food Myths.  ●  Sports Nutrition& its Effects on performance (Fluid & Meal in take, pre, during and post Competition).  ●  Food Supplements for children  Balanced diet   A diet which contains the proper amount of each nutrient, i.e. like carbohydrate, fat, protein etc. is called Balanced Diet. A diet which consists of all the essential food constituents’ viz. protein, carbohydrates, fats, vitamins, minerals and water in correct proportion is called balanced diet. A balanced diet contains sufficient amounts of fiber ...
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PLANNING IN SPORT Chapter 1 Notes Class 12 || Meaning and objectives of planning || Various committees and responsibilities || Tournaments || Method for draw of fixture || Intramural and Extamural || Specific sports programs ||

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                                                       CHAPTER - 1                                          PLANNING IN SPORT Meaning and objectives of planning:  Planning is an intellectual process of thinking in advance about setting of goals and developing strategies which are requires to attain the goals efficiently.  Meaning and objectives of planning : “Planning is a way to systematize, direct and organize the events or competitions and extract the advantage and benefit of the available resources.”  “Planning is the process of making a sequence of work for a future line of action” . The success of Physical education programs depends upon efficient staffing, food, direction, proper control, well super vision, good co-ordinat...
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QUANTUM NUMBERS (Principal, Azimuthal, Magnetic and Spin)

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                  QUANTUM NUMBERS  Orbitals represent regions in the space around the nucleus where the probability of finding the electron is maximum. A large number of electron orbitals are possible in atom. These can be distinguished by their size, shape and orientation of the orbitals. To describe each electron in an atom in different orbitals, we need a set of three numbers known as quantum numbers. These are designated as n, l and m. In addition to these three numbers another quantum number is also needed which specifies the spin of the electron. These four numbers are called quantum numbers. These are discussed below: 1. Principal quantum number (n) :  This quantum number determines the main energy shell or level in which the electron is present. It is denoted by n. It can have whole number values starting from 1 such as n = 1, 2, 3, 4 ... This quantum number also identifies as shell. The shell with n 1 is called the first sh...
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Diagonal Relationship between Beryllium and Aluminium || Relation between Beryllium and Aluminium

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  Diagonal Relationship between Beryllium and Aluminium The ionic radius of Beryllium (Be 2+) is estimated to be nearly 31 pm; the charge/radius ratio Or e/m ratio is nearly the same as that of the Al 3+ ion. Hence beryllium resembles aluminium in these ways. Some of the similarities are given below: » Like Aluminium, Beryllium(be) is not readily attacked by acids H+ donor because of the formation of an oxide film on the surface of the metal by reacting with oxygen, i.e. they are rendered passive by nitric acid. » Beryllium hydroxide[[Be(OH)4]2] dissolves in excess of alkali to give a beryllate ion, [ Be(OH)4]2– just as aluminium hydroxide[Al(OH)3] gives aluminate ion, [Al(OH)4] » The chlorides of metals beryllium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong as Lewis acids They are used as Friedel Craft catalysts. » Beryllium(Be) and aluminium(Al) ions have strong tendency to form complexes, (Be...
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Math question

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A tower, x metre, has a flagstaff at its top. The tower and flagstaff subtends equal angles at a point distant y metre from the foot of the tower. Then find the length of the flagstaff ( in metre). 
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Solar System, Planets, Moons, Asteroid Belt,Kuiper Belt and Oort Cloud, Comets and Meteoroids

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 The solar system consists of the Sun, which is a star at its center, and all the celestial bodies bound by its gravitational pull. These bodies include planets, moons, asteroids, comets, and other objects. Key Components of the Solar System: The Sun : The Sun is the center of the solar system and contains about 99.86% of its mass. It is a star primarily composed of hydrogen and helium, providing the heat and light that sustains life on Earth. Planets : There are eight recognized planets in the solar system: Mercury : The closest planet to the Sun, known for extreme temperature variations and no atmosphere. Venus : Similar in size to Earth but with a thick, toxic atmosphere and surface temperatures hot enough to melt lead. Earth : The third planet from the Sun, the only known planet to support life, with water and a breathable atmosphere. Mars : Known as the Red Planet, it has a cold, dry surface and signs of past water. Jupiter : The largest planet, a gas giant, w...
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