The book Electricity And Magnetism was written by author Fleeming Jenkin Here you can read free online of Electricity And Magnetism book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Electricity And Magnetism a good or bad book?
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1 24 Electricity and Magnetism. [CHAP. VI. about 135 would be required to give an electro-magnet the maximum possible strength. 19. The relative intensity of magnetisation in the same field for different substances has not been very fully studied ; in other words, the values of k for different materials and different values of * are not well known. The following table is deduced from relative values obtained by Barlow, to which I have added nickel and cobalt, from relative values given by Pliic...ker : Soft wrought iron . 32-8 Soft cast steel . 23-3 Cast iron . . . 23 Hard cast steel . 16*1 Soft steel. . . 21-6 Nickel . . 15-3 Hard steel . . 17-4 Cobalt . . 32*8 These values can only be approximately true. A complete table of the values of k would require to contain a set of values for each material, and each value of / ; whereas the value of / for which the above values hold good is not known. The maximum intensity of magnetisation for hard steel is less than for soft iron, and from some experiments of Pliicker, 1 it appears that this difference is about 37 per cent, but a much greater intensity of field is required to produce the maximum of magnetisation.
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