Mechanics of solids and fluids

Inter-atomic forces: the forces acting between the atoms due to electrostatic interaction between the charges of the atoms are called intern-atomic forces. Thus inter-atomic forces are electrical in nature. In case of non-uniform charge distribution, the center of mass of positive charge may not coincide with the center of mass of negative charge. Such a

Read More

Dimensional formula and SI Units

Specific gravity have no units and no dimension. Force= Mass* acceleration = mass* Velocity/time= M (1), L(1), T (-2); SI unit, Newton Universal Constant of gravitation (G)= M (-1), L (3), T(-2); N*m^2/kg^2 Work dimension = Energy = M(1), L(2)T (-2);  Joule Moment of force dimension same as of Work but SI unit is N-m.

Read More

Laws of Motion

Linear momentum of the body is the quantity of motion contained in the body. Newton’s third law of motion signifies that forces in nature always occur in pairs. A single isolated force is not possible. Force of action and reaction act always on different bodies. Hence, they never cancel each other. Each force produce its

Read More

Kinematics

Kinematics is that branch of mechanics which deals with the study of motion of objects without taking into account the factors (i.e. nature of forces, nature of bodies etc.) which cause motion. Rectilinear motion is that motion in which a particle or point mass body is moving along a straight line. Translatory motion is that

Read More

Electrical devices

Electrical devices Fermi energy is the maximum possible energy possessed by free electrons of a material at absolute zero temperature. The value of Fermi energy for different materials is different. Fermi level in semiconductor. It is that energy level in energy band diagram of semiconductor for which the probability of occupancy becomes half. The electric

Read More

Gravitation

Gravitation is the name given to the force of attraction between any two bodies of the universe. It was discovered by the Newton in the year 1665. F= Gm1m2/r^2 Evidence in support of Newton’s law of Gravitation The rotation of earth around the sun or moon around the earth is explained on the basis of

Read More

Work-Energy-Power

Work, Energy and Power Work is said to be done by a force action on a body, provided the body is displaced actually in any direction except in a direction perpendicular to the direction of the force.  absolute unit of work is Joule and ergs. 1 joule = 10^7 ergs. Gravitational unit of  work is

Read More

Dual nature of matter; Atom and Nuclie

Dual Nature of matter and radiation J Thomson predicted that the cathode rays are nothing but the stream of fast moving electrons. The number of photoelectrons emitted per second is directly proportional to the intensity of the incident radiations. Above the threshold frequency, the maximum kinetic energy of the emitted photoelectron is independent of the

Read More

Electromagnetic-waves

Marconi is consider as the father of wireless communication. Maxwell displacement current is that current which comes into play in that region in which the electric field and the electric flux is changing with time. The maxwell’s concept that a changing electric field with times give rise to displacement current also produces a magnetic field

Read More