Magnetic dipole, bar magnet and magnetic materials - One Line Questions

1. The magnetic susceptibility of iron at room temperature is approximately: — 10³
2. The magnetic field at the equatorial line of a short bar magnet is: — Along the axis, in the direction opposite to that at the axial line
3. What is the direction of the magnetic field at the equatorial point of a bar magnet? — Along the axis, in the direction opposite to the magnet's dipole moment
4. Which of the following is an example of a ferromagnetic material? — Steel
5. A magnetic dipole is placed in a uniform external magnetic field. The potential energy is minimum when the dipole moment is: — Parallel to the magnetic field
6. The magnetic field intensity (H) is related to the magnetic flux density (B) and magnetization (M) by: — B = μ₀(H + M)
7. The magnetic field lines of a bar magnet always form: — Closed loops originating from the north pole and ending at the south pole.
8. The Curie temperature is associated with which type of magnetic material? — Ferromagnetic
9. When a ferromagnetic material is heated above its Curie temperature, it becomes: — Paramagnetic
10. Which magnetic material is used to make permanent magnets? — Ferromagnetic materials
11. Which type of magnetism is characterized by strong attraction to magnets and the ability to form permanent magnets? — Ferromagnetism
12. A bar magnet has poles of equal strength. If one pole is broken off, what is the nature of the resulting pieces? — Each piece will be a bar magnet with two poles.
13. A material that is weakly repelled by a magnet is: — Diamagnetic
14. What is the property of ferromagnetic materials that allows them to retain magnetism after the external magnetic field is removed? — Hysteresis
15. The magnetic dipole moment of a current loop is given by: — IA
16. Which of the following is a diamagnetic material? — Copper
17. A bar magnet is cut into two equal halves by a plane perpendicular to its length. What happens to the pole strength of each half? — It remains the same.
18. The magnetic dipole moment of a bar magnet is zero if: — Its pole strength is zero.
19. What is the magnetic susceptibility of a vacuum? — Zero
20. Which of the following factors does NOT affect the magnetic dipole moment of a bar magnet? — External magnetic field strength
21. A magnetic dipole of moment 'M' experiences a torque 'τ' in a magnetic field 'B'. The torque is given by: — M × B
22. The force acting on a magnetic pole of strength 'm' in a magnetic field 'B' is given by: — mB
23. If the pole strength of a magnet is 'm' and its length is '2l', its magnetic dipole moment is: — ml
24. The ratio of magnetic field intensity to magnetic field strength in a material is called: — Relative permeability
25. At the neutral point of a bar magnet, the magnetic field is: — Zero
26. The magnetic field lines inside a bar magnet go from: — South pole to North pole
27. Which of the following materials has the highest magnetic permeability? — Ferromagnetic
28. What is the property of a material that indicates how easily it can be magnetized? — Susceptibility
29. Which of the following is a measure of how easily a magnetic material can be demagnetized? — Coercivity
30. The magnetic field lines of a solenoid carrying current are similar to those of a: — Bar magnet
31. What is the magnetic susceptibility of a diamagnetic material? — Negative and small
32. The magnetic susceptibility (χ) of a paramagnetic material is: — Positive and small
33. The magnetic field at the axial point of a short bar magnet is proportional to: — 1/r³
34. Which of the following is a property of magnetic materials that describes their ability to support the formation of a magnetic field? — Permeability
35. What is the SI unit of magnetic dipole moment? — Ampere-meter
36. What is the unit of magnetic permeability? — Henry per meter
37. The magnetic field lines are most crowded near: — The poles of the magnet
38. The magnetic flux density (B) at a point is defined as: — The number of magnetic field lines passing through a unit area.
39. The magnetic moment of an atom is primarily due to: — The spin of electrons.
40. The magnetic field lines are discontinuous at: — Magnetic monopoles (if they existed)
41. When a diamagnetic material is placed in a non-uniform magnetic field, it tends to move towards: — The region of weaker field
42. When a paramagnetic material is placed in a non-uniform magnetic field, it tends to move towards: — The region of stronger field
43. The force between two magnetic poles is proportional to: — The inverse square of the distance between them.
44. Which property distinguishes ferromagnetic materials from paramagnetic materials? — Their ability to be magnetized permanently.
45. Which of the following is a characteristic of magnetic field lines? — They are closed loops.
46. Which of the following correctly describes the magnetic field lines of a bar magnet? — They are closed loops, passing from north to south outside and south to north inside.
47. Which of the following is NOT a unit of magnetic flux? — Gauss
48. The magnetic field at the center of a bar magnet is approximately: — Zero
49. What is the relationship between magnetic permeability (μ) and magnetic susceptibility (χ) for a material? — μ = 1 + χ
50. Which of the following represents the magnetic flux density of a bar magnet at a distance 'r' along its axis? — μ₀M / (2r³)
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