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In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section. [1] The current density vector is defined as a vector whose magnitude is the electric current per cross-sectional area at a given point in space, its direction being that of the motion of the positive charges at this point.
Apart from this all NCERT books are available in Flip book format. NROER is an collaborative platform, intend to reached the un-reached [ 2 ] and institutions like SCERT , SIERT, SIE, Vigyan Prasar , CCERT, Gujarat Institute of Educational Technology (GIET), SIET and other stake holders have their share in the educational content.
An online system named ePathshala, a joint initiative of NCERT and Ministry of Education, has been developed for broadcasting educational e-schooling resources including textbooks, audio, video, publications, and a variety of other print and non-print elements, [18] ensuring their free access through mobile phones and tablets (as EPUB) and from ...
where is the current density, is the external electric field, is the electronic density (number of electrons/volume), is the mean free time and is the electron electric charge. Other quantities that remain the same under the free electron model as under Drude's are the AC susceptibility, the plasma frequency , the magnetoresistance , and the ...
In electromagnetism, Jefimenko's equations (named after Oleg D. Jefimenko) give the electric field and magnetic field due to a distribution of electric charges and electric current in space, that takes into account the propagation delay (retarded time) of the fields due to the finite speed of light and relativistic effects.
J is the current density (with J tot being the total current including displacement current). [b] D is the displacement field (called the electric displacement by Maxwell). ρ is the free charge density (called the quantity of free electricity by Maxwell). A is the magnetic potential (called the angular impulse by Maxwell).
Charge carrier density, also known as carrier concentration, denotes the number of charge carriers per volume. In SI units, it is measured in m −3. As with any density, in principle it can depend on position. However, usually carrier concentration is given as a single number, and represents the average carrier density over the whole material.