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Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago
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Sia ? 6 years, 2 months ago
- Paramagnetic materials
- Diamagnetic materials
- Ferromagnetic materials
- Ferrites
Yogita Ingle 6 years, 2 months ago
(A) Phenomenological classification
- Such type of classification is based on sign and magnitude of magnetic susceptibility χ
- According to this type of classification there are three type of magnetic material
i) Diamagnetic materials -> χ < 0
i.e magnetic susceptibility is negative
ii) Paramagnetic material -> χ > 0
i.e magnetic susceptibility is positive and less then unity
iii) Ferromagnetic material -> χ>> 0 - i.e magnetic susceptibility is positive and is very high
(B) Main Effects of external Field
- Main effects related to the actions of external field on magnetic moments of atomic carriers are
i) Diamagnetic effects
ii) Paramagnetic effects
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Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
Diamagnetic substances are those which have a tendency to move from stronger part to the weaker part of the external magnetic field. We can also say that the diamagnetic substances get repelled by a magnet.
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Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago
꧁≪Mämƭå ℭℏᑌĎℎàℜÿ? 6 years, 2 months ago
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Sia ? 6 years, 2 months ago
As we know, to determine the electric field at any point on the surface of a charged spherical conductor of radius r applying Gauss's theorem,
{tex}E = \frac { q } { 4 \pi \varepsilon _ { 0 } r ^ { 2 } }{/tex}
Hence electrostatic potential, {tex}V = -\int \mathbf { E } \cdot d \mathbf { r } = \frac { q } { 4 \pi \varepsilon _ { 0 } \cdot r }{/tex}
where, {tex}\varepsilon _ { 0 } = 8.854 \times 10 ^ { - 12 } \mathrm { C } ^ { 2 } \mathrm { N } ^ { - 1 } \mathrm { m } ^ { - 2}{/tex} = permittivity of free space or vacuum
The capacitance of the spherical conductor situated in vacuum is given by
{tex}C = \frac { q } { V } = \frac { q } { \frac { 1 } { 4 \pi \varepsilon _ { 0 } } \cdot \frac { q } { r } } \Rightarrow C = 4 \pi \varepsilon _ { 0 } r{/tex}
Hence, the capacitance of an isolated spherical conductor situated in a vacuum is always {tex}4 \pi \varepsilon _ { 0 }{/tex} times of its radius.
Posted by Live To Drive 6 years, 2 months ago
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Pratishtha Dubey 6 years, 2 months ago
Yogita Ingle 6 years, 2 months ago
The average velocity attained by some particle such as an electron due to the influence of an electric field is termed as the drift velocity. The movement or the motion of the particles is assumed to be along a plane and hence the motion can also be referred to as the axial drift velocity.
When conductor is subjected to an electric field E, each electron experience a force.
F=-eE
and acquires an acceleration
a = F/m = - eE/m -----(i)
Here m = mass of election, e = charge, E = electric field.
The average time difference between two consecutive collisions is known as relaxation time of election.
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Lavi Kadiyan 6 years, 2 months ago
1Thank You