**4. Determination of the curve B = f (H) for magnetodielectric material**

To determine this curve was used fluxmeter method. For this, was done a sample of material with thoroidal shape and that were winding two coils. Figure 7 is showing the shape and the dimension of the MDM sample.

**Figure 7.** The dimension of the MDM sample

The dimension of the thoroidal sample is:

84 Dielectric Material

U [V] I [mA]

**Figure 6.** Variation of resistivity with temperature

shape and the dimension of the MDM sample.

**Figure 7.** The dimension of the MDM sample

R [Ω]

2 100 1.14 87710 2033,11 40 24,54 3 100 1,02 98030 2272 50 46,32 4 100 0,12 833000 19308,9 60 74,98 5 100 0,017 5714280 132457 70 58,59

**4. Determination of the curve B = f (H) for magnetodielectric material** 

To determine this curve was used fluxmeter method. For this, was done a sample of material with thoroidal shape and that were winding two coils. Figure 7 is showing the

1 100 3,14 31840 738,05 26

ρ [Ωm] T [ 0C ] α

Nr. det

**Table 4.**

```
De = 46 mm 
    Di = 34 mm 
    Dm = 40 mm 
    a = 6mm 
    b = 6mm 
Number of turns in primary :N1= 368 
Number of turns in secondary :N2= 1
```
Scheme used to determine the dependence B = f (H) is shown in Figure 8

**Figure 8.** Scheme used to determine the dependence B = f (H)

Magnetic field is calculated with relation:

$$H = \frac{N\_1 \cdot I}{\pi \cdot D\_m} \quad \left[\frac{A}{m}\right] \tag{2}$$

and magnetic flux density is given by the expression:

$$B = \frac{\Phi}{2N\_2 \cdot S} \tag{3}$$

where S is the section of the toroidal core magnetodielectric material.

Measured and calculated values are presented in the table 5.

Figure 9 show the first magnetization. With [\*] are the values which have been determined from measurements
