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6 Jan 2014

CBSE Class 12 Physics Notes : Magnetism

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The property of any object by virtue of which it can attract a piece of iron or steel is called magnetism. Natural Magnet A natural magnet is an ore of iron (Fe3O4), which attracts small pieces of iron, cobalt and nickel towards it. Magnetite or lode stone is a natural magnet. Artificial Magnet A magnet which is prepared artificially...
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20 Feb 2014

CBSE Class 12 Chemistry Notes : Surface Chemistry

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Surface Chemistry is the branch of chemistry which deals with the phenomenon that occurs on the surfaces or interfaces, such phenomenon includes corrosion. catalysis, crystallisation, etc Adsorption Due to unbalanced attraction forces, accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed as adsorption. The molecular species accumulates at the...
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11 Feb 2014

Class 12 Important Questions for Maths – Integrals

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NCERT Exemplar Class 12 Maths is very important resource for students preparing for XII Board Examination. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 12. Question from very important topics are covered by NCERT Exemplar Class 12. You also get idea about the type of questions and method to answer in your class...
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3 Dec 2013

CBSE Class 12 Physics Notes : Current Electricity

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Electric Current (I) The rate of flow of charge through any cross-section of a wire is called electric current flowing through it. Electric current (I) = q / t. Its SI unit is ampere (A). The conventional direction of electric current is the direction of motion of positive charge. The current is the same for all cross-sections of a...
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5 Oct 2013

CBSE Class 11 Physics Notes : Hydrodynamics

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Viscosity The property of a fluid by virtue of which an internal frictional force acts between its different layers which opposes their relative motion is called viscosity. These internal frictional force is called viscous force. Viscous forces are intermolecular forces acting between the molecules of different layers of liquid moving with different velocities. where, (dv/dx) = rate of change...
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3 Oct 2013

What is a Radar ?

Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, an emitting antenna, a receiving antenna (separate or...
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