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Electromagnetic Induction Worksheet
1. What is a magnet?
2. What is a natural magnet? [Punjab 02]
3. What does the word lodestone mean?
4. Are the two poles of a magnet equally strong?
5. What is a magnetic dipole? Give an example.
6. Define the term magnetic dipole moment. Give its SI unit. [CBSE OD 95; Haryana 02]
7. Is magnetic moment a vector? If yes, give its direction.
8. Define a unit magnetic pole.
9. Write the SI unit of (i) pole strength and (ii) magnetic moment of a bar magnet. [CBSE F 03]
10. What is the direction of magnetic dipole moment?
Magnetism and Matter Worksheet Class 12 Physics
11. What is the torque experienced by a magnetic dipole moment m placed with its axis at angle θ with a uniform magnetic field B ? [ISCE 93]
12. In a uniform magnetic field, when is the torque on a magnet (i) maximum and (ii) minimum?
13. Give the position of a magnetic dipole held in a magnetic field, where its potential energy is minimum. [CBSE OD 93]
14. In which position, the potential energy of a magnet in a uniform magnetic field is zero ?
15. On which factors does the pole strength of a magnet depend ?
16. If a magnet is broken into pieces, which one of the following remains unchanged in each part – mass, moment of inertia, magnetization?
17. Define the term magnetic dipole moment of a current loop. [CBSE D 17C]
18. A coil, of area A→, carrying a steady current I, has a magnetic moment, m→, associated with it. Write the relation between m→, I and A→ in vector form. [CBSE D 16C]
19. An electron which is a charged particle in motion has a magnetic moment. Why then does a neutron, which has no charge, have a magnetic moment ?
20. Define Bohr magneton and write its value.
21. How much is the magnetic moment of an electron revolving in the n th orbit of hydrogen atom ?
22. Who first discovered earth’s magnetism ?
23. How much is the approximate distance upto which the earth’s magnetic field extends ?
24. Give an order of magnitude of earth’s magnetic field near its surface.
25. What is magnetic axis of the earth ?
26. What is geomagnetic equator ?
27. What is geomagnetic meridian ? [CBSE D 92]
28. What is geographic meridian ?
29. Name the elements or parameters of earth’s magnetic field.
30. Define declination at a place.
Magnetism and Matter Worksheet Class 12 Physics
31. Define angle of dip (or magnetic inclination) at a place.
32. What will be the angle of dip at a place on the equator ?
33. What is the angle of dip at magnetic poles ?
34. How does dip angle vary from equator to poles ?
35. What will be the value of the horizontal component of earth’s magnetic field at earth’s geomagnetic pole ? [CBSE F 95]
36. Horizontal components of Earth’s magnetic field at a place is √3 times the vertical component. What is the value of angle of dip at this place ? [CBSE D 97]
37. The vertical component of Earth’s mangetic field at a place is √3 times the horizontal component. What is the value of angle of dip at this place ?
38. The needle of the dip circle is vertical at the magnetic poles. The dip circle is rotated about a vertical axis through 90°. What will be the position of the needle on the vertical circular scale ?
39. Where on the surface of earth is the angle of dip (i) 0° and (ii) 90° ? [CBSE OD 11]
40. A magnetic needle, free to rotate in a vertical plane, orients itself with its axis vertical at a certain place on the earth. What are the values of :
(a) horizontal component of earth’s magnetic field ?
(b) angle of dip, at this place ? [CBSE F 12]
41. The horizontal component of the earth’s magnetic field at a place is B and angle of dip is 60°. What is the value of vertical component of earth’s magnetic field at equator ? [CBSE D 12]
42. Where on the earth’s surface is the vertical component of the earth’s magnetic field zero ?
43. What are isogonic lines ?
44. What are isoclinical lines ?
45. What is an aclinic line ?
46. What are isodynamic lines ?
47. Define neutral point in the magnetic field of a bar magnet. [Punjab 02]
48. A magnet is placed with the north pole towards the north of the earth. Predict the position of the neutral points.
49. What is the difference between a compass needle and dip needle ?
50. At a certain location in Africa, a compass needle points 15° West of the geographic north. What is the angle of declination at that point ? [Haryana 97]
51. Torques τ1 and τ2 are required for a magnetic needle to remain perpendicular to the magnetic fields B1 and B2 at two different places. What is the ratio of the magnetic fields at the two places ?
52. Give the order of magnetic moment of an atom.
53. What is induced magnetism ?
54. What is a magnetising field ?
55. Define magnetic intensity. Give its SI unit.
56. Define magnetic induction. Give its SI unit.
57. Define magnetisation of a material. Give its SI unit.
58. Define magnetic permeability. State its SI unit. [ISCE 98]
59. What is relative permeability ?
60. Define magnetic susceptibility. [Haryana 01]
61. Relative permeability of a material, μr = 0.5. Identify the nature of the magnetic material and write its relation to magnetic susceptibility. [CBSE D 14C]
62. What is the one quantum of atomic dipole moment called ?
63. What is a diamagnetic substance ? [Punjab 97]
64. Which of the following substances are diamagnetic ?
Bi, Al, Na, Cu, Ca and Ni [CBSE D 13]
65. What is a paramagnetic substance ? [Punjab 98C, 99]
66. Which of the following substances are paramagnetic ? Bi, Al, Cu, Ca, Pb, Ni [CBSE D 13]
67. What is a ferromagnetic substance ?
68. Relative permeability (μr) of a material has a value lying 1 < μr < 1 + ε (where ε is a small quantity). Identify the nature of the magnetic materials. [CBSE D 14C]
69. Relative permeability of a material μr = 400. Identify the nature of the magnetic material.
70. The permeability of bismuth is 0.9983. To which class of magnetic materials, does bismuth belong ? [CBSE D 11]
71. How does the intensity of magnetisation of a paramagnetic sample vary with temperature ?
72. Will the neon gas be diamagnetic or paramagnetic ? Give reason.
73. What is curie point ?
74. Give two essential characteristics of a material used for preparing an electromagnet.
75. Define hysteresis.
76. What does the area of hysteresis loop indicate ?
77. The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetisation, which piece will dissipate greater heat energy ?
78. What is the basic use of a hysteresis curve ?
79. Name two alloys commonly used for making cores of transformers.
80. Name two magnetic materials commonly used for making permanent magnets.
81. Suggest two methods to destroy the magnetism of a magnet. [Punjab 02]
82. What are permanent magnets ? Give one example. [CBSE D 13]
83. How does the magnetic permeability μr differ for dia, para and ferromagnetic materials ?
84. Mention the two characteristic properties of the material suitable for making core of a transformer. [CBSE OD 12]
85. A (hypothetical) bar magnet (AB) is cut into two equal parts. One part is now kept over the other, so that pole C2 is above C1. If M is the magnetic moment of the original magnet, what would be the magnetic moment of the combination so formed ? [CBSE Sample Paper 08]
86. An electric current of 0.25 A flows in a loop of radius 0.2 cm. Calculate the magnitude of the magnetic dipole moment of the dipole formed. [ISCE 02]
87. Depict the behaviour of magnetic field lines in the presence of a diamagnetic material.
88. Two circular loops, of radii r and 2r, have currents, I and I / 2 flowing through them in clockwise and anticlockwise sense respectively. If their equivalent magnetic moments are M1 and M2 respectively, state the relation between M1 and M2. [CBSE Sample Paper 2011]
89. At a place, the horizontal component of earth’s magnetic field is B, and angle of dip is 60°. What is the value of horizontal component of the earth’s magnetic field at equator ?