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If we have to strain a ferromagnetic crystal along certain direction, we would change the inter atomic spacing not only along this direction but also in other direction. And hence the exchange interactions between the atomic spins are also changed. This would lead to a change in the magnetization property of crystal. When an iron crystal is placed in a magnetic field along an easy direction, it gets longer along this direction but contracts in the transverse directions. The longitudinal strain $l/l along the direction of magnetization is called magnetostriction constant denoted by λ. When the crystal reaches saturation magnetization, λ also reaches saturation called saturation strain. The crystal lattice strain energy associated with magnetostriction is called magnetostrictive energy. Magnetostriction is responsible for transformer hum noise.
Lawson criterion (J.D. Lawson): A situation for the release of energy from a thermonuclear reactor. Usually it is stated as the minimum value for the product of the density of
Unit vector which is perpendicular to the resultant of 2i+3j+5k and -i+2j+7k ; and passes by (1,2,4)
The speed at which a wave propagates down a string is 300 meters per second. If the frequency of this wave is 150 Hertz, what is the wavelength of this wave? Ans: The wavel
An automobile travels due north with a speed of 93 km/h and an acceleration of 1.6 m/s2. All forces considered, the unbalanced force acting on the auto is
Kerr effect (J. Kerr; 1875): The ability of certain substances to refract light waves differently whose vibrations are in distinct directions while the substance is placed wit
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what is the work done of a man standing on a height of 13 meter holding a bag of 6 kg
Copernican principle (N. Copernicus) The idea, recommended by Copernicus, that the Sun, not the Earth, is at the middle of the Universe. Now we know that neither idea is accur
Binding energy of a system is described as the energy released when its constituents are brought from infinity to form the system. It can also be explained as the energy required s
Enrique Iglesias belts out a high-C (1024 Hz) from the deck of his yacht. What is the wavelength of this sound wave in the surrounding air? As the sound wave enters the ocean below
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