4 Description of laboratory research facility and methodology of measurements

5. Data processing

(Same as in Laboratory work № 2-2).

6. Work execution order and experimental data analysis

7. Test questions

1. What are the diamagnetics?

2. What are the paramagnetics?

3. What are the ferromagnetics? What their magnetization mechanism is? What is hysteresis phenomenon? Make a drawing of hysteresis loop and give explanations.

4. How the magnetic permeability of ferromagnet depends on magnetic field intensity magnitude?

5. Draw the scheme of lab 3-4. Derive magnetic field intensity magnitude formula which is used in this work. Derive magnetic induction magnitude formula which is used in this work

8. Content of the report

Homework to laboratory work № 3-4

(Answers on test questions from p.59)

…

Laboratory work №3-4 implementation protocol

1) Тopic: STUDYING MAGNETIC FIELD IN FERROMAGNETS

2) Goal:

1. Study magnetic induction in ferromagnetic dependence on magnitude of magnetic field intensity.

2. Study magnetic permeability dependence on magnitude of magnetic field intensity.

3) Scheme of laboratory research facility:

4) Table of measuring instruments

№ п.п.	Name	Type	Serial number	Grid limit	Grid unit	Accuracy class
1.	Miliampermeter	M906
2.	Oscilloscope	ЭО-7

5) Equations for calculation

1. Magnetic field intensity:

H = k_x n_x;

where n_x – x-coordinate of vertex of hysteresis loop;

–scale factor;

n₁ = 1,1510⁴ m^-1 – number of terns per unit length in primary coil;

R₁= 27 Ω – resistance of the primary coil;

u_x = 6 10^-2 Vmm^-1 – horizontal sensitivity of oscilloscope.

2. Magnetic field induction:

B = k_y n_y,

where n_y – y-coordinate of vertex of hysteresis loop;

–scale factor;

R₂ = 3000 Ω – resistance of the secondary coil;

N₂ = 600 - number of winds in secondary coil;

u_y = 4 10^-2 Vmm^-1 – vertical sensitivity of oscilloscope;

C = 1,510^-6 F – additional capacity of secondary coil’s circuit; ;

S = 310^-5 m² – area of capacitor’s plates.

3. Relative permeability

,

where ₀ = 410^-7 Hm^-1 – magnetic constant.

6) Table of measurements

№	nx, mm	ny, mm	H, A/m	B, T	
1.
2.
3.
4.
5.
6.
7.
8
9.
10.	-	-	-	-	-

7) Calculation of quantities and their errors

8) Graph (example! Do not redraw!!!):