Viva Questions:

How to determine magnetic susceptibility using FeCl3 liquid in Quincke's tube experiment. Some viva questions are listed here that might be useful for you to understand the experiment. I have not written the answer here because if you have performed the experiment it is obvious you will be familiar with these answers. If by chance you don't get an answer directly from any source you can ask by comment box.

Experiment Related Information:

Personally I feel the viva questions provide a vision to understand the physical concept with a new vision. What happens in the lab? We just note down the reading and then calculations etc, but rarely some students analysis the results.

These questions actually help to develop that analysis part. Hope it will help you.

1. What is susceptibility?

2. What is magnetization and how it can be achieved?

3. Does an atom with one electron in the outer shell can behave like a bar magnet? or simply do an atom can be equivalent to the bar magnet?

4. What is the atomic dipole?

5. How to find the atomic dipole element?

6. What is magnetic field induction and magnetic field intensity, how you will define it and what is the relationship between them?

7. How do you see magnetic field density in a region of a magnetic field by bar magnet?

8. What is the unit of magnetic field induction (density) and magnetic field intensity and from which letters we represent to them?

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9. What is the role of an external magnetic field in the magnetization of the material, how atomic dipole moments of atoms play the role in the magnetization?

10. Can you explain the types of magnetic material (Diamagnetic, Paramagnetic, Ferromagnetic, Antiferromagnetic) on the basis of atomic dipole moments?

11. In which unit you measure the magnetic field intensity H, meniscus height h in your observation?

12. Do you have plot the graph between h and H^2, if yes where you will use the slope of this graph and why?

13. In which unit system you calculated the value of susceptibility, SI or CGS?

14. What is g in the magnetic susceptibility formula and unit of it?

15. What is Gauss Probe and for what purpose we use it?

16. What is an electromagnet, how do we use it to magnetize the material?

17. Why the FeCl3 liquid in Quincke's tube rise or fall in the presence of an external magnetic field?

18. Will magnetic field intensity increase after increasing the current of an electromagnet?

19. What signifies the value of the susceptibility in your experiment?

20. Can you determine the magnetic susceptibility value of the iron piece from Quincke's method?

Sources/Information Required to Explain/Understand the Experiment :

1. Atomic Dipole and its Magnetic Moment Concept

2. Magnetization

3. Types of Magnetic Materials

4. Working of Electromagnet

5. Unit system (SI or CGS)

6. Magnetic field and Magnetic Field Intensity Concepts

7. Nature of the Force on the magnetic material (here liquid) in the presence of external magnetic field

8. Magnetic susceptibility role