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Millikan's Oil-drop Experiment

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            Millikan's Oil-drop Experiment In 1909, Robert Millikan was the first to find the charge of an electron his now-famous oil-drop experiment. In that experiment, tiny oil drops were sprayed into a uniform electric field between a horizontal pair of oppositely charged plates. The drops were observed with a magnifying eyepiece, and the electric field was adjusted so that the upward force on some negatively charged oil drops was just sufficient to balance the downward force of gravity. That is, when suspended, upward force qe just equaled Mg. Millikan accurately measured the charges on many oil drops and found the values to be whole number multiples of 1.6 x 10-19 C the charge of the electron. For this, he won the Nobel prize.
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A charged particle is free to move in an electric field. It will travel (a) always along a line of force (b) along a line of force, if its initial velocity is zero (c) along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force (d) none of these.

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Ques :  A charged particle is free to move in an electric field. It will travel (a) always along a line of force (b) along a line of force, if its initial velocity is zero  (c) along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force (d) none of these. Ans : (b) along a line of force, if its initial velocity is zero 
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An electron moving with a constant velocity v along X-axis enters a uniform electric field Y-axis. Then the electron moves (a) with uniform acceleration along Y-axis (b) without any acceleration along Y-axis (c) in a trajectory represented as y = ax² applied along (d) in a trajectory represented as y= ax

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Ques : An electron moving with a constant velocity v along X-axis enters a uniform electric field Y-axis. Then the electron moves  (a) with uniform acceleration along Y-axis  (b) without any acceleration along Y-axis (c) in a trajectory represented as y = ax² applied along (d) in a trajectory represented as y= ax Ans:  (c) in a trajectory represented as y = ax² applied along
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OHM’S LAW AND RESISTANCE

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            OHM’S LAW AND RESISTANCE Ohm’s Law : If the physical state i.e. temperature, nature of material and dimensions of a conductor remain unchanged then the ratio of potential difference applied across its ends to current flowing through it remains constant.                             V = I R R = V / I = resistance of conductor Resistance : SI Unit : volt/ampere or ohm () Conductance(G) : The reciprocal of resistance is called conductance.                              G = 1/ R SI Unit : ohm–1 or mho or siemens Dimensions : [M–1 L–2 T3 A2] The substances which obey ohm’s law are called ohmic or linear conductor. The resistance of such conductors is independent of magnitude and polarity of applied potential difference. Here the graph between I and V is a straight line passing through the origin. » The rec...
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Maxima and Minima || Local maxima || Local minima || Turning Point || Ist Order derivative test || IInd Order derivative test || Global Maxima and Global Minima || Class 12 Maths || AOD Application of derivative ||

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Current electricity important points copy notes Class 12 Chapter 3 Physics

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10th NCERT physics all SI units

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 Mass  → kilogram (kg)  Time → second (sec)  Speed → m/s Velocity → m/s Temperature → kelvin (K)  Amount of substance → mole(mol)  Length → meter (m)  Current (I) → Amphere (A)  Potential difference → volt (V)  Weight → kilogram (kg)  Luminous intensity → Candella (Cd) 
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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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