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Differentiate soft magnetic material from hard magnetic material in respect of hysteresis losses, eddy current losses and domain wall motion with appropriate examples and plots.
Soft magnetic materials should have low hysteresis losses and low eddy current losses. Easy domain wall motion is key factor in keeping hysteresis losses to a minimum. Increasing electrical resistivity of magnetic medium reduces eddy current losses. Hard magnetic materials should retain a large part of their magnetization on removal of the applied field. Obstacles to domain wall motion must be provided in permanent magnets so that energy product high residual induction Br times larger coercive force Hc is large.
Q. Explain about beta radiation? The second common kind of radiation is beta radiation which consists of high-energy electrons called beta particles (β -particles).
Calculation of Equivalent Weight ofEDTA
What is the effective nuclear charge of 2s for Fe?
1 gm of a metallic oxide on reduction gives 0.68 gm of the metal. ans) Mass of metal/mass of oxygen=eq. mass of metal/eq. mass of oxygen. applying this we get .68/.32=x/8 x=1
Entropy (S) is a molecular 'disorder', or more precisely 'the number of microscopic arrangements of energy possible in a macroscopic sample'. Entropy depends strongly on the state
The number of orbitals present in the shell with n= 4 is: (1) 16 (2) 8 (3) 18 (4) 32 Ans: 16
What are the Advantages of cold working (i) No heat is required. (ii) Better surface finish is obtained. (iii) Superior dimension control. (iv) Improved strength and h
Reactions of Benzene Nucleus - Nitration Phenol reacts along with dilute nitric acid at 5-10°C to form ortho and para nitro phenols, although the yield is meager because of oxi
In the study of mechanisms of various chemical reactions, Deuterium and Tritium are used as tracers.
Which type of bonding exists in Li 2 o and CaF 2 respectively : (1) Ionic, ionic (2) Ionic, covalent (3) Covalent, ionic
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