Fig.1 Experimental setup A : 1- microwave generator, 2- ferrite isolator, 3- PIN amplitude modulator, 4 - attenuator, 5-hibrid T junction, 6- sample waveguide segment , 7- short circuit plunger, 8- electromagnet , 9- attenuator, 10- short circuit plunger, 11- diode detector, 12- selective amplifier, 13- power supply (electromagnet controller), 14 - CPU integrated system. B : a – glass-covered wire, b – fix cap, c – glass capillary, d – pan with marked masses , e- X band waveguide , f – electromagnet