V.4 No 1

79

Study of electromotive force induced by heterogeneous magnetic field

3. Technique of study

The technique developed at our laboratory was based on two experiments which were conducted before with identical primary and secondary loops.

In the first experiment we expected to study the field of closed core, when the distance between its lateral side and one of sides of the secondary loop increases, as shown in Fig. 7.

Fig. 7. The first experiment to study the attenuation of magnetic field of closed core in space: 1 is the closed magnetic core, 2 is the primary winding, 3 is the secondary movable loop, and 4 is the rule

This study was complementary and served to indicate more accurately the velocity of induction emf decrease in the secondary loop, dependently on, how far this loop is located from the core. This allowed to determine the degree of inhomogeneity of magnetic field, which was necessary in the analysis of the second, main experiment.

The second experiment has been made so. The nearer to the core side of secondary loop was put inside the core and fixed during the experiment, while the further side of loop was approached to the core by way of deformation of lateral sides, as shown in Fig. 8.

Fig. 8. The experiment with deforming loop: 1 is the closed magnetic core, 2 is the primary loop, 3 is the secondary transformed loop, and 4 is the rule

The aim of experiment was to check the regularity of emf variation under the increasing and decreasing area of loop; this allowed to establish unambiguously, which formulation of induction law is true.

Actually, if the induction is induced in the loop as the whole, when the area of secondary loop diminishes, the quantity of force lines of variable magnetic field bonded with this loop will diminish. So, if the Maxwell formulation is true, when approaching the outer side of secondary loop to the core, we will observe the induction emf diminishing.

But if we consider the induction in view of Faraday formulation, we have to suppose immediate interaction of electrons in the wire with the magnetic field near this wire. In this phenomenology, the approach of outer side of secondary loop will cause the wire outer from the core gradually entering the region of larger amplitude of magnetic field, which will cause the increase of measured emf in the loop as the whole.

Thus, if the inductance in the loop placed to the variable magnetic field obeys the Maxwell phenomenology, the emf has to diminish with the approach of outer side of loop, and if the processes obeyed Faraday phenomenology, it has to increase. As the predicted results are opposite, it enables us to establish distinctively, which conception of induction is true.