V.4 No 1

83

Study of electromotive force induced by heterogeneous magnetic field

6. Description of the second experimental set

As we already said in the item 3, the second experiment differed only in the location of secondary loop as to the rod of core. In this experiment the inner side of loop was located in the window of core and was fixed as to it, as shown in Fig. 12.

Fig. 12. Experimental set to measure the emf amplitude in the secondary loop, when the loop area diminished

During the experiment, the outer side of loop has been brought from the core, retaining its geometry. The area of secondary loop changed nonlinearly, indeed. Basically, we could calculate the change, thinking the area of secondary loop as the sum of two ellipses and the rectangle, but we have no necessity in it, as the target of this experiment is not to measure the degree of nonlinearity of the magnetic field strength in the near of core. For this purpose we have conducted the first experiment with the unchanged shape of secondary loop and already established this fact. As we emphasised above, in the present experiment we are interesting in the direction of emf amplitude change with the change of area of secondary loop. Dependently on, whether the amplitude of emf will increase either decrease with the increasing area of secondary loop, we can unambiguously establish, which formulation is true. The fact of adjustable change of the area of secondary loop, which can take the same size when measuring the emf at different frequencies (by way of fixing the position of the outer side of secondary loop in relation to the rule) can be thought satisfying for this purpose.