Science > Physics > Force > Centre of Mass and Centre of Gravity In this article. we shall study the concept of centre of mass and centre of gravity of a body and methods to locate them. Concept of Centre of Mass: The entire mass of a body is supposed to be concentrated at a […]
Science > Physics > Force > Law of Conservation of Momentum In this article, we shall study the law of conservation of momentum and its proof. Statement: When the resultant external force acting on a system is zero, the total linear momentum of the system is constant. OR When no external force acts on a […]
Science > Physics > Heat Transfer > Conduction Heat always gets transferred from the body and higher temperature to a body at lower temperature heat transfer can take place in three ways a) Conduction b) Convection and c) Radiation. In this article, we shall study the heat transfer by the conduction. Conduction: If one end […]
Science > Physics > Cathode Rays and X- Rays > Cathode Rays In 1859, Julius Plucker started the study of the conduction of electricity through gases at low pressure in the discharge tube. William Crooke, J. Perrin, J. J. Thomson did a further investigation in this field. In 1885, Sir William Crookes carried out several […]
Science > Physics > Cathode Rays and X- Rays > X-Rays Discovery of X- Rays: If a discharge tube is highly evacuated so that the pressure in the tube is of the order of 0.01 mm of mercury, certain rays are emitted by the cathode in the form of bluish streamers. These rays are called […]
Science > Physics > Heat Transfer > Convection and Radiation In this article, we shall study different modes of heat transfer. Convection: Convection is a mode of heat transfer through a material medium in which heat energy is carried from one place to another by actual motion “migration” of heated matter. Consider a beaker containing […]
Some liquids like water Kerosene flow very easily while some liquids like honey, glycerine do not flow easily. The property by virtue of which a liquid or a fluid opposes the relative motion between two adjacent layers is called viscosity. The force which opposes the relative motion between two adjacent layers in a fluid is […]
Science > Physics > Electromagnetic Induction > Resonating Circuit In this article, we shall study resonating circuit: a) LCR Series Circuit and b) LC parallel circuit. Series Resonating Circuit: Consider LCR circuit containing Resistance R, Inductance L and capacitance C connected in series. Let the combination be connected to an A.C. source supplying current i […]
Science > Physics > Electromagnetic Induction > The Reactance of a Circuit In this article, we shall study the concept of the reactance of inductive and capacitive circuits. Concept of Reactance of a Circuit: When A.C. current flows through a circuit, the resistance of the circuit opposes the flow of current. The circuit may contain […]
Science > Physics > Electromagnetic Induction > Rotation of a Coil in Uniform Magnetic Field In this article, we shall study the rotation of coil in uniform magnetic field, the concept of alternating current. The principle of Electrical Generator: Consider a circular coil of ‘n’ turns of each area A placed with its plane perpendicular […]