Point Object: An object can be considered as a point mass object, if the distance travelled by it in a motion is very large in comparison to its dimensions. Rest If an object does not change its position with respect to its surroundings with time, then it is called at rest. Motion If an object … Read more
Electromagnetic Induction Electromagnetic induction is the phenomenon of production of electric field with the help of varying magnetic field. Magnetic Flux and Magnetic Flux Density Magnetic flux (φ) through any surface is defined as the number of magnetic lines of force crossing through that surface. the magnetic flux (φ) through the surface is defined as … Read more
Nuclear Reactions The process by which the identity of a nucleus is changed when it is bombarded by an energetic particle is called nuclear reaction. Let a nucleus X (called parent nucleus) be bombarded by an energetic particle c. The resultant nucleus after the interaction between X and a is Y (called daughter nucleus) and … Read more
Rectifier: It is a device which converts ac voltage to dc voltage.Principle: Rectifier is based on the fact that, a forward bias p-n junction conducts and a reverse bias p-n junction does not conduct. Rectifiers are of three types: 1. Half wave rectifier 2. Full wave rectifier3. Bridge rectifier Half-wave rectifier: The rectifier which converts … Read more
Transistor The transistor was invented in 1948 by John Bardeen, Walter Brattain and William Shockley at Bell Laboratory in America. A transistor is basically a silicon or germanium crystal containing three separate regions. It can either be n-p-n-type or p-n-p-type. It has three regions.The middle region is called the base and the two outer regions are called … Read more
Electric charge Electrostatics is a branch of physics that deals with the phenomena and properties of stationary or slow-moving electric charges with no acceleration. Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charges: positive and negative. … Read more
Electric Lines of Force Electric lines of force in an electric field is defined as the paths along which a unit positive charge tends to move if it is free to do so. The tangent drawn at any point on electric line of force gives the direction of electric field intensity at that point. Note:It … Read more
Electric Field and its physical significance The space surrounding an electric charge Q in which another charge q experiences an electrostatic force of attraction or repulsion,is called the electric field of charge Q. ** Here charge Q is called the source charge and charge q is the called test charge. As we know that electrostatic … Read more
Quantum physics or Quantum Mechanics or Quantum Theory It is the study of the microscopic world. When we talk at microscopic level, many quantities are found only in certain minimum (elementary) amounts, or integer multiples of those elementary amounts; these quantities are then said to be quantized. The elementary amount that is associated with such … Read more
Potential Energy of Dipole in a Uniform Electric Field The work done in rotating the dipole from one orientation to another is stored in the form of energy called potential energy of dipole. It is a scalar quantity.S.I. unit of potential energy is joule (J). Work done to rotate the dipole electric field through an … Read more
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