Its commerce is, ho wever, almost entirely of the nature of transit trade, for it is not the chief distributing centre for the middle of Europe of the products of all other parts of the world, but is also the chief outlet for German, Austrian, and even to some extent Russian (Polish) raw products and manufactures.0 | 0 |
C T CI ?OH CI " N O Cl OH _Cl OH C1 2 Nz0 C12 C C Ciz C1 2 Clt Cit (r) (2) (3) (4) CCI /CH2 CU CI C 'CO H CH ?C02H CI C. t 'c% CCI t CH3 (5) (6) 0 C1 /N C1 2 ClZ',C12 NzO C12 (2) CI (3) HO 2 C [[Ccichc1 Cc1 2 Co Cc13 - (6) Ho 2 C Ccichci]] CCl?0 | 0 |
Ho, Testes.0 | 0 |
Forces acting on a Small Body in the Magnetic Field.-If a small magnet of length ds and pole-strength m is brought into a magnetic field such that the values of the magnetic potential at the negative and positive poles respectively are V 1 and the work done upon the magnet, and therefore its potential energy, will be W =m(V2-Vi) =mdV, which may be written W =m d s- = M d v= - MHo = - vIHo, ds ds where M is the moment of the magnet, v the volume, I the magnetization, and Ho the magnetic force along ds.0 | 0 |
3 +t 47fK o, Whence H Ho Ho (33) _ 3 __ 3 3r 47rK /1+2 and B =µH- + 2 Ho.0 | 0 |
The demagnetizing force inside a cylindrical rod placed longitudinally in a uniform field Ho is not uniform, being greatest at the ends and least in the middle part.0 | 0 |
The small magnet may be a sphere rigidly magnetized in the direction of Ho; if this is replaced by an isotropic sphere inductively magnetized by the field, then, for a displacement so small that the magnetization of the sphere may be regarded as unchanged, we shall have dW = - vIdHo = v I+-, whence W = - 2 I + H2 ° (37) The mechanical force acting on the sphere in the direction of displacement x is 1 Hopkinson specified the retentiveness by the numerical value of the " residual induction " (=47rI).0 | 0 |
DW F - d -v 1+ a 7rK dx dH (38) (34) [[[Magnetic Measurements]] If Ho is constant, the force will be zero; if Ho is variable, the sphere will tend to move in the direction in which Ho varies most rapidly.0 | 0 |
If a hollow sphere 7 of which the outer radius is R and the inner radius r is placed in a uniform field Ho, the field inside will also be uniform and in the same direction as Ho, and its value will be approximately 3 i - R 3 For a cylinder placed with its axis at right angles to the lines of force, 2 = Ho (41) 2 +4(-2)(i - R2) These expressions show that the thicker the screen and the greater its permeability o, the more effectual will be the shielding action.0 | 0 |
H2 _ Ho (40) FIG.0 | 0 |
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