Eddy Current Eddy currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday’s law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. When a changing magnetic flux is applied to a bulk piece of conducting material Read more about Eddy Current[…]

Magnetic Field Due to a Cylindrical Wire Magnetic field due to a cylindrical wire is obtained by the application of Ampere’s law. 1) Outside the Cylinder: In all above cases magnetic field outside the wire at P, ∫B̄.dl̄̄ = µ₀I ⇒ B ∫dl = µ₀i. B x 2πr = µ₀i ⇒ Bout = µ₀i/ 2πr Read more about Magnetic Field Due to a Cylindrical Wire[…]

Friction is a Cause of Motion It is a general misconception that friction always opposes the motion. No doubt friction opposes the motion of a moving body but in many cases, it is also the cause of motion. For example: 1) While moving, a person or vehicle pushes the ground backwards and the rough surface Read more about Friction is a Cause of Motion[…]

Heating Curve If to a given mass (m) of a solid, heat is supplied at constant rate P and a graph is plotted between temperature and time, the graph is as shown in figure and is called heating curve. From this curve it is clear that: 1) In the region OA temperature of solid is Read more about Heating Curve[…]

Characteristics of Standing Waves When two identical waves moving in opposite directions interfere, it results in a standing wave. These waves are characterized by the zero displacement locations which are fixed and are called as nodes and locations of maximum displacements called as antinodes. 1) Standing waves can be transverse or longitudinal. 2) The disturbance Read more about Characteristics of Standing Waves[…]

Co – Efficient of Friction between a Body and Wedge If we slide (or) try to slide a body over a surface, the motion is resisted by a bonding between the body and the surface. This resistance is represented by a single force and is called friction force. The force of friction is parallel to Read more about Co – Efficient of Friction between a Body and Wedge[…]

Refrigerator (Or) Heat Pump A refrigerator of heat pump is basically a heat engine run in reverse direction. It essentially consists of three parts: 1) Source: At higher temperature . 2) Working Substance: It is called refrigerant liquid ammonia and freon works as working substance. 3) Sink: At lower temperature . The working substance takes Read more about Refrigerator (Or) Heat Pump[…]

Viscosity and Newton’s Law of Viscous Force In case of steady flow of a fluid when a layer of fluid slips or tends to slip on adjacent layers in contact, the two layers exert tangential force on each other which tries to destroy the relative motion between them. The property of a fluid due to Read more about Viscosity and Newton’s Law of Viscous Force[…]

Bohr’s Atomic Model Bohr proposed a model for hydrogen atom which is also applicable for some lighter atoms in which a single electron revolves around a stationary nucleus of positive charge Ze. Bohr’s model is based on the following postulates: 1) He postulated that an electron in an atom can move around the nucleus in Read more about Bohr’s Atomic Model[…]