CLASS – XII

Electric field intensity of a uniformly charged infinitely long thin wire: Let us consider a long thin wire having uniformly positive linear charge density λ. We consider the elementary length dl of the wire carry small charge dq = λdl at a distance l from point O of the wire. The magnitude of the electric […]

Electric field intensity:  Electric field is a region of space around a charge or a system of charges which extends upto infinity within which other charged particles experience electrostatic force. The electric field strength or field intensity at a point in an electric field is the force acting on a test charge (unit positive charge)

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

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,

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.