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CBSE Class 12 Study Material

Semiconductor Electronics: Materials, Devices and Simple circuits (part-1)

classification of material like insulators, metal and semiconductor are done on the basis of valance band and conduction band.

 
Atoms (part-2)

Atoms (part-2)

Published on: 05-FEB-2013

The negative change of the electron is equal to the positive change if the nucleus. So the whole atom is neutral

Semiconductor electronics: materials, devices and simple circuits (part-2)

Published on: 05-FEB-2013

The various features of the Earth's magnetic field vary in a predictable way across the surface of the globe.

Semiconductor Electronics: Materials, Devices and Simple circuits (part-1)

Semiconductor Electronics: Materials, Devices and Simple circuits (part-1)

Published on: 05-FEB-2013

classification of material like insulators, metal and semiconductor are done on the basis of valance band and conduction band.

Electromagnetic waves (part-2)

Electromagnetic waves (part-2)

Published on: 05-FEB-2013

The spectrum of electromagnetic waves stretches, in principle, over an infinite range of wavelengths. Different regions are known by different names; γ-rays, X-rays, ultraviolet rays, visible rays, infrared rays, microwaves and radio waves in order of increasing wavelength from 10–2 Å or 10–12 m to 106 m..

Electromagnetic waves (part-1)

Electromagnetic waves (part-1)

Published on: 05-FEB-2013

Maxwell found an inconsistency in the Ampere’s law and suggested the existence of an additional current, called displacement current, to remove this inconsistency. This displacement current is due to time-varying electric field acts as a source of magnetic field in exactly the same way as conduction current.

Communication systems (part-2)

Communication systems (part-2)

Published on: 05-FEB-2013

Every message signal occupies a range of frequencies. The bandwidth of a message signal refers to the band of frequencies, which are necessary for satisfactory transmission of the information contained in the signal.

Communication systems (part-1)

Communication systems (part-1)

Published on: 05-FEB-2013

Communication pervades all stages of life of all living creatures. Irrespective of its nature, every communication system has three essential elements- transmitter, medium/channel and receiver.

Atoms (part-1)

Atoms (part-1)

Published on: 05-FEB-2013

The size of the nucleus very small and also the density of the nucleus is very high. The estimated size of the nucleus is one Fermi. The centre space of atom is empty

Nuclei (part-2)

Nuclei (part-2)

Published on: 05-FEB-2013

Nuclear force is defined as the force between any two nucleons is called nuclear force. It can be force between proton, neutron proton, and neutron. Nuclear force is always attractive and is independent of charge. It is the strongest force in nature

Nuclei (part-1)

Nuclei (part-1)

Published on: 05-FEB-2013

An atomic mass unit (u) is a unit of mass used to express atomic and molecular weights. One atomic mass unit (1u) is defined as one twelfth (1/12) of the mass of an atom of carbon-12.

Wave optics (part-2)

Wave optics (part-2)

Published on: 05-FEB-2013

The various features of the Earth's magnetic field vary in a predictable way across the surface of the globe.

Wave optics (part-1)

Wave optics (part-1)

Published on: 05-FEB-2013

Huygens ’ Principle tells us that each point on a wave front is a source of secondary waves, which add up to give the wave front at a later time. Light has dual Nature. It possesses particle nature and wave nature both

Ray optics and optical instruments (part-2)

Ray optics and optical instruments (part-2)

Published on: 04-FEB-2013

The capability of a lens or mirror converge or diverge light is called as focal length. For an optical instrument in air, it is the distance over which initially collimated rays are brought to a focus.

Ray optics and optical instruments (part-1)

Ray optics and optical instruments (part-1)

Published on: 04-FEB-2013

Ray optics and optical instruments is the most important chapter in class 12 physics as per NCERT. This

Alternating Current (Part-1)

Alternating Current (Part-1)

Published on: 04-FEB-2013

In alternating current (AC, also ac), the flow of electric charge periodically reverses direction. Audio and Radio signals carried on electrical wires are also examples of alternating current.

Alternating Current (Part-2)

Alternating Current (Part-2)

Published on: 04-FEB-2013

The induced current opposes the cause of its origin. Len’s law is in accordance with the law of conservation of energy.

Electromagnetic induction (part-2)

Electromagnetic induction (part-2)

Published on: 02-FEB-2013

The induced current opposes the cause of its origin. Len’s law is in accordance with the law of conservation of energy.

Electromagnetic induction (part-1)

Electromagnetic induction (part-1)

Published on: 02-FEB-2013

The magnetic flux through a surface of area A placed in a uniform magnetic field B. Faraday’s laws of induction imply that the emf induced in a coil of N turns is directly related to the rate of change of flux through it

Magnetism and matter (part-2)

Magnetism and matter (part-2)

Published on: 02-FEB-2013

The various features of the Earth's magnetic field vary in a predictable way across the surface of the globe.

Magnetism and matter (part-1)

Magnetism and matter (part-1)

Published on: 02-FEB-2013

We can define a bar magnet as it is simply a permanent magnet having a shape of a bar. It has a north and a south pole. Its magnetic field is said to go out from the North Pole and in to the South Pole.

Moving charges and magnetism (part-2)

Moving charges and magnetism (part-2)

Published on: 01-FEB-2013

We can generate magnetic fields by using and the toroid and solenoid . The television uses the solenoid to generate magnetic fields needed

Moving charges and magnetism (part-1)

Moving charges and magnetism (part-1)

Published on: 01-FEB-2013

To describes how an electric field affects and is affected by a medium , we can use Electric permittivity. It is determined by the ability of a material to polarise in response to an applied field, and thereby to cancel, partially, the field inside the material.

 

Probability (part-2)

Probability (part-2)

Published on: 01-FEB-2013

We can express probability as: the number of occurrences of a targeted event divided by the number of occurrences plus the number of failures of occurrences.

Probability (part-1)

Probability (part-1)

Published on: 01-FEB-2013

The branch of mathematics which deals with calculating the likelihood of a given event's occurrence, which is expressed as a number between 1 and 0 is termed as probability. An event with a probability of 1 can be considered a certainty.

Linear Programming (part-2)

Linear Programming (part-2)

Published on: 01-FEB-2013

Linear optimization is the alternate name given to the term linear programming. Sometimes it also known as, is the problem of maximizing or minimizing a linear function over a convex polyhedron. Simplistically, linear programming is the optimization of an outcome based on some set of constraints using a linear mathematical model.

Linear Programming (part-1)

Linear Programming (part-1)

Published on: 01-FEB-2013

Linear optimization is the alternate name given to the term linear programming. Sometimes it also known as, is the problem of maximizing or minimizing a linear function over a convex polyhedron. Simplistically, linear programming is the optimization of an outcome based on some set of constraints using a linear mathematical model.

Three-dimensional Geometry (part-2)

Three-dimensional Geometry (part-2)

Published on: 31-JAN-2013

Angle between skew lines is the angle between two intersecting lines drawn from any point (preferably through the origin) parallel to each of the skew lines.

Three-dimensional Geometry (part-1)

Three-dimensional Geometry (part-1)

Published on: 31-JAN-2013

In this video we will talk about the direction cosines and direction ratios of a line joining two points and also discuss about the equations of lines and planes in space under different conditions, angle between two lines, two planes, a line and a plane, shortest distance between two skew lines and distance of a point from a plane

Vectors Algebra (part-2)

Vectors Algebra (part-2)

Published on: 31-JAN-2013

The vector sum of two coinitial vectors is given by the diagonal of the parallelogram whose adjacent sides are the given vectors.

Vectors Algebra (part-1)

Vectors Algebra (part-1)

Published on: 31-JAN-2013

The quantity which involves only one value (magnitude) which is a real number is called as scalars. However, an answer to the second query is a quantity (called force) which involves muscular strength (magnitude) and direction (in which another player is positioned). Such quantities are called vectors.

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