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according alloys already ampere angle apparatus apparent magnitude applied axis behaviour bismuth body circle circuit closed cobalt coefficient components condition conductor connection consideration constant corresponding course curve deflection diamagnetic direction distance earth electric current electro-magnetic electron equal equation exactly example experiment ferro-magnetic substances filament formula further galvanometer Gauss Hall effect Heusler alloys horizontal hysteresis increase light lines of force longitudinal magnetic field magnetic force magnetic induction magnetic needle magnetizable magnetometer magnetomotive force magnitude means measure ment method molecular magnets nature negative nickel observations obtained Ohm's Law parallel paramagnetic permanent magnets perpendicular phenomena phenomenon Phys plane polar position potential present proportional quantities regard relation remanence represented result right-angles ring rotation shown in Fig side simple soft iron sort south pole steel strength of field surface susceptibility temperature terrestrial magnetism theory tion torsion turning wire Zeeman effect zero