^Retentivity (ob) :
The value of I even when the H is reduced to zero.
Entries by kp-web-admin
^Hysteresis
Hysteresis Hysteresis is the lag of intensity of magnitisation (I) behind the magnetising field (H) is called hystersis.
^Ferromagnetism
Ferromagnetism The existence of domains leads to strongest magnetism in ferromagnetics. Due to the presence of cohesive forces in ferromagnetics the unpaired electron spins to line up parallel with each other in a region called a domain. A ferromagnetic domain is a region of crystalline matter whose volume may be between 10–12 m3 to 10–8 […]
^Paramagnetism
Paramagnetism About 90% paramagnetism is due to spin motion of electrons. Paramagnetics are permanent weak magnets & posses magnetism even in the absence of external magnetising field. On placing a paramagnetic in external magnetising field its atomic dipoles tend to align so as to get weakly magnetized in the direction of the magnetizing field. Paramagnetism […]
^Diamagnetism
Diamagnetism Diamagnetics are temporary weak magnets posses magnetism only when placed in external magnetising field. It is found in the atoms or molecules having even number of electrons. In the unmagnetized form of a diamagnetic the magnetic moments of the two electrons having same value of principle quantum number ‘n’ have equal & opposite value […]
^Cause of magnetism
Cause of magnetism 1. Electrons, protons, neutrons all posses magnetic moment due to both orbital & spin motions. This magnetic moment is ultimately responsible for magnetism. 2. due to spin is also called intrinsic magnetic moment or permanent magnetic moment & can be understood using quantum mechanics only. 3. associated with the orbital motion of […]
^The analogy
The analogy Both electricity & magnetism has several uses in daily life. Both have the following common features: 1. Are fundamental & conservative forces of nature. 2. Obey inverse square law. 3. Can interact with other materials through induction. 4. Repulsion is the surest test of both magnetism & electricity. 5. Change in electricity produces […]
^Properties of a magnet
Properties of a magnet 1. The pole strength ‘m’ of a magnet depends upon the nature of material of a magnet, its state of demagnetization & area of cross section of the magnet but is independent of any bend in the magnet. 2. For a bar magnet 3. On cutting a magnet in two identical […]
^Motional emf
Motional emf No motional emf will be produced across the conductor if any two vectors are parallel to each other. Polarity of the emf can be checked knowing the direction of drift of electrons using .
^Some more useful situations
Some more useful situations 1. The ratio of magnetic dipole moment to angular momentum for a uniformly charged configuration 2. A current loop behaves like a magnetic of dipole moment M = A N I, here I → current in loop, A → loop area & N → its no. of turns. 3. A current […]
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