Coulomb’s law: According to Coulomb’s law the electrostatic force between two stationary point charges is directly proportional to the product of their magnitude and inversely proportional to the square of the distance between them. This force acts along the line joining the two charges which is repulsive if the charges have the same polarity and […]
Explore MoreQuantization of charge: Quantization is the property of an electric charge by virtue of which all observable charged body can have charge which is an integral multiple of the basic or elementary charge ‘e’ (e = 1.6 10-19 C). I.e. Q = ne where Q is the total charge of a body and n 1, […]
Explore MoreCharging by friction: When two objects are rubbed together, one object loses electrons while the other gains electrons. So electron is transferred from one object to the other. The object that gains electrons becomes negatively charged, while the object that loses electrons has an excess of positive charge. There is a series called triboelectric series. […]
Explore MoreMirror formula: If an object is at a distance u from the pole of a mirror of focal length f, then image distance is v. The Mirror formula is . The derivation of mirror formula is given in the blog ‘Reflection class – XII‘. To get the information click the given button. Click here Graph: […]
Explore MoreImage formation by a concave mirror: 1. When position of object is at infinity, position of image is at principle focus (F). Image is real inverted highly diminished. 2. When position of object is in between infinity and centre of curvature (C), position of image is in between focus (F) and the centre of curvature […]
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Laws of reflection: 1st Law -The incident ray, the reflected ray, and the normal, all lie on the same plane, called the plane of incidence. The incident and reflected rays are on the opposite side of the normal. 2nd Law – The angle of incident is always equal to the angle of reflection. If i […]
Explore MoreCircular motion: Angular displacement: When a particle is in circular motion about an axis or centre, the angle described by the radius about the axis or centre is called angular displacement. A particle rotates in a circular path of radius r about the centre O. The particle moves from A to B through the circumference […]
Explore MoreDisplacement – time graph: i). The slope of displacement – time graph gives velocity. A and B are two points on the graph and AC is parallel to x axis and BC is perpendicular to AC. The change in displacement is BC = and the change in time is AC = . The slope of […]
Explore MoreVertical motion: 1. When a body is dropped from a height under gravity and neglecting the resistive forces, then, initial velocity of the body (u) is zero. The acceleration of the body is a = g. The velocity of the body at time t is v = gt [using v = u + at]. The […]
Explore More1. Prove v = u + at: Let us consider a particle is moving with uniform velocity u. Then it accelerates uniformly with a and after time t its final velocity is v. The change in velocity is (v – u) for time t. The acceleration of the particle is a . Or, Or, at […]
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