Diamagnetic Paramagnetic and Ferromagnetic Materials - UNSOLVED PRACTICE SET
Chapter: Magnetism and Matter | Topic: Diamagnetic Paramagnetic and Ferromagnetic Materials
DIAMAGNETIC PARAMAGNETIC AND FERROMAGNETIC MATERIALS - UNSOLVED PRACTICE SET
Topic: Diamagnetic Paramagnetic and Ferromagnetic Materials
Multiple Choice Questions
Q1. When a diamagnetic material is placed in a non-uniform magnetic field, it tends to move:
- Towards the stronger part of the field
- Towards the weaker part of the field
- Perpendicular to the field direction
- In a circular path
Q2. The magnetic susceptibility of a paramagnetic material is:
- Negative and large
- Positive and small
- Negative and small
- Positive and very large
Q3. Which of the following is a ferromagnetic material?
- Bismuth
- Aluminium
- Iron
- Copper
Q4. When heated above the Curie temperature, a ferromagnetic material becomes:
- Diamagnetic
- Paramagnetic
- More strongly ferromagnetic
- Superconducting
Q5. The relative magnetic permeability of a diamagnetic material is:
- Greater than 1
- Equal to 1
- Slightly less than 1
- Very large
Q6. Liquid oxygen shows paramagnetic behaviour because:
- It contains free electrons
- Its molecules have permanent magnetic dipole moments
- It is a good conductor of electricity
- It has a high density
Short Answer Questions
Q7. What is magnetic susceptibility? Compare the susceptibility values of diamagnetic, paramagnetic, and ferromagnetic materials.
Q8. Why does a paramagnetic material become diamagnetic above its Curie temperature? Explain.
Q9. A student places a piece of bismuth and a piece of iron near a strong bar magnet. Describe what happens to each material and explain why.
Q10. Why are ferromagnetic materials strongly attracted by magnets? Explain in terms of magnetic domains.
Q11. How would you distinguish between a paramagnetic and a ferromagnetic material using a simple experiment with a bar magnet?
Q12. Explain why the magnetic susceptibility of a paramagnetic material varies inversely with absolute temperature (Curie's law).
Long Answer Questions
Q13. Explain the origin of magnetism in materials at the atomic level. Distinguish between diamagnetic, paramagnetic, and ferromagnetic materials on the basis of:
(i) Electronic configuration
(ii) Response to external magnetic field
(iii) Temperature dependence
Q14. What are magnetic domains? Explain how the domain theory accounts for the properties of ferromagnetic materials, including hysteresis.
Q15. Compare the behaviour of diamagnetic, paramagnetic, and ferromagnetic materials when placed in:
(a) A uniform magnetic field
(b) A non-uniform magnetic field
Support your answer with diagrams.
Numerical & Application-Based Problems
Q16. A paramagnetic material has a magnetic susceptibility of 2.5 × 10⁻⁴ at room temperature (300 K).
(a) Calculate its relative permeability.
(b) If the material is placed in a magnetic field of intensity 2 × 10⁵ A/m, calculate the magnetization produced in the material.
(c) Using Curie's law, predict the susceptibility at 450 K.
Q17. The magnetic susceptibility of a ferromagnetic material is 5000 at room temperature. The material is shaped into a toroid with 1000 turns per metre and carries a current of 0.5 A.
(a) Calculate the magnetic field intensity (H) inside the toroid.
(b) Calculate the magnetization (I) of the material.
(c) Calculate the magnetic field (B) inside the toroid.
(d) If the temperature is raised above the Curie point, how would these values change?
Q18. In your school's chemistry lab, you find the following materials: a copper coin, an aluminium foil, an iron nail, a piece of bismuth, and a stainless steel spoon.
(a) Classify each material as diamagnetic, paramagnetic, or ferromagnetic.
(b) A student brings a strong bar magnet near each material one by one. Describe what happens in each case and explain the observation.
(c) The student then heats the iron nail until it glows red and brings the magnet near it again. What change, if any, would be observed? Explain with the concept of Curie temperature.