Quantization 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, […]
Electric charges and field Part – 2 Read More »
Charging 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.
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Mirror 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:
Reflection through curved surface Part – 3 Read More »
Image 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
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Circular 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
Displacement – time graph: 1. 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
Vertical 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
1. 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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Speed: The distance travelled by a particle per unit time is called speed. Speed is a scalar quantity. Speed = . If s distance travelled by a particle in time t then speed of the particle is . SI unit of speed is ms-1 and the dimension is [LT -1]. Uniform speed: A particle or
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