Here is a question bank for **Chapter 15: Electromagnetism
### **Short Questions (120)**
#### **Easy (30% - 36 questions)**
1. What is electromagnetism?
2. Define magnetic field.
3. What creates a magnetic field around a conductor?
4. What is a steady current?
5. Define the magnetic effect of a current.
6. How does a magnetic field affect a current-carrying conductor?
7. What is meant by the right-hand rule?
8. Define the force on a current-carrying conductor.
9. How does current direction affect the direction of the magnetic field?
10. What is electromagnetic induction?
11. State Lenz's Law.
12. What is a DC motor?
13. How does a magnetic field exert a force on a conductor?
14. What is an AC generator?
15. What is a transformer?
16. What is mutual induction?
17. What is the principle of a transformer?
18. Describe one use of a transformer.
19. Define high voltage transformer.
20. What is an electromagnet?
21. What is meant by induced current?
22. State Faraday’s Law of electromagnetic induction.
23. Define the term “armature.”
24. Describe the purpose of a commutator in a DC motor.
25. What is the role of brushes in a DC motor?
26. What is an electric coil?
27. What does Lenz's Law state about the direction of induced current?
28. How is magnetic flux defined?
29. What does a transformer do to voltage?
30. What is a primary coil in a transformer?
31. What is a secondary coil in a transformer?
32. How does AC differ from DC in current flow?
33. What is the function of an AC generator?
34. What is meant by the term “alternating current”?
35. What does a current-carrying coil in a magnetic field experience?
36. What is the purpose of a transformer in a power supply?
#### **Moderate (40% - 48 questions)**
37. Explain how a magnetic field is created around a current-carrying conductor.
38. How is the direction of force on a conductor determined?
39. Explain the right-hand rule in detail.
40. Describe how force acts on a current-carrying conductor in a magnetic field.
41. How does a DC motor work?
42. Describe how current direction affects magnetic field direction in a conductor.
43. Explain how the turning effect occurs in a coil within a magnetic field.
44. What is the function of the coil in an electric motor?
45. Describe the components of an AC generator.
46. How does electromagnetic induction occur?
47. State Faraday’s First Law of Electromagnetic Induction.
48. State Faraday’s Second Law of Electromagnetic Induction.
49. How does Lenz's Law relate to energy conservation?
50. What is the difference between mutual and self-induction?
51. How does a transformer change voltage levels?
52. Describe the basic principle of a transformer.
53. Why are transformers important in power distribution?
54. Explain the role of primary and secondary coils in a transformer.
55. What is the purpose of a high-voltage transformer?
56. Describe mutual induction in simple terms.
57. How does an AC generator produce alternating current?
58. Describe the working of an AC generator.
59. What are the main parts of a transformer?
60. How does Lenz's Law determine the direction of induced current?
61. Describe the role of magnetic flux in electromagnetic induction.
62. What does “step-up” mean in relation to transformers?
63. What does “step-down” mean in relation to transformers?
64. Describe the role of the armature in a generator.
65. Explain how Lenz's Law applies to induced currents.
66. What is the role of the core in a transformer?
67. Describe one practical use of electromagnetic induction.
68. Explain the difference between direct and alternating current.
69. How does mutual induction relate to transformers?
70. Describe the role of brushes in a generator.
71. What happens to a current-carrying coil in a magnetic field?
72. Explain why AC is used in transformers.
73. How does a change in magnetic flux induce an EMF?
74. Explain why the direction of induced current opposes the change in flux.
75. How is an electromagnet different from a permanent magnet?
76. Describe how an AC generator functions to produce electricity.
77. What is the importance of alternating current in power systems?
78. Describe the difference between AC and DC motors.
79. How is electric current generated in an AC generator?
80. What is the purpose of the core material in a transformer?
81. Describe the process of step-up transformation.
82. Describe the process of step-down transformation.
83. Explain why iron is used as a core material in transformers.
84. What is the relationship between EMF and magnetic flux?
85. Explain the effect of the number of coil turns on induced EMF.
86. What are the basic requirements for electromagnetic induction?
87. Explain why transformers do not work with DC.
88. How does an electric motor convert electrical energy to mechanical energy?
89. What are the applications of electromagnetic induction?
90. Describe how a transformer operates in an AC circuit.
91. Explain how current direction is reversed in an AC generator.
92. How does a magnetic field affect moving charges in a conductor?
93. Describe how a transformer’s efficiency is affected by heat.
94. Explain the role of magnetic flux in the working of an electric motor.
95. Describe the main parts of a transformer and their functions.
#### **Tough (30% - 36 questions)**
96. Derive the expression for force on a current-carrying conductor in a magnetic field.
97. Explain the turning effect in a current-carrying loop within a magnetic field.
98. Explain how Fleming's Left-Hand Rule is used in determining force direction.
99. Describe in detail the working principle of a DC motor.
100. Derive Faraday's Law of electromagnetic induction.
101. Explain the working of an AC generator with a diagram.
102. Describe the process of mutual induction in transformers.
103. Explain why AC generators are more efficient for long-distance power transmission.
104. How does magnetic flux linkage affect induced EMF?
105. Explain how self-induction differs from mutual induction.
106. Describe the working principle of a transformer with a labeled diagram.
107. How does Lenz’s Law demonstrate energy conservation?
108. Explain how increasing coil turns increases induced EMF.
109. Derive the formula for the transformer ratio.
110. Explain how voltage is increased in a step-up transformer.
111. Describe the working of a high-voltage transformer.
112. What is electromagnetic damping, and how is it applied in practice?
113. Explain the impact of eddy currents in transformers.
114. How does mutual induction occur between two coils?
115. Explain why transformers are not 100% efficient.
116. Describe how a transformer can be designed to reduce energy losses.
117. Explain the difference in construction between a step-up and step-down transformer.
118. Describe the principle of induction as used in an electric generator.
119. What factors affect the efficiency of a transformer?
120. Explain how electromagnets are used in electric motors and generators.
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### **Long Questions (10)**
#### **Easy (30% - 3 questions)**
1. Explain the magnetic effects of a steady current and describe how a magnetic field is created around a current-carrying conductor.
2. Describe the working principle of a DC motor and explain the role of each component in its operation.
3. Define electromagnetic induction. State and explain Faraday's Laws of Electromagnetic Induction with examples.
#### **Moderate (40% - 4 questions)**
4. Explain the process of electromagnetic induction. How is Lenz’s Law used to determine the direction of induced current?
5. Describe the construction and working principle of a transformer. Explain the difference between step-up and step-down transformers.
6. Explain the principle and working of an AC generator with a labeled diagram.
7. Describe mutual induction and how it is applied in transformers. Explain how mutual induction contributes to the efficiency of transformers.
#### **Tough (30% - 3 questions)**
8. Derive the expression for the force acting on a current-carrying conductor placed in a magnetic field. Explain the use of Fleming’s Left-Hand Rule.
9. Discuss the working principle and practical applications of high-voltage transformers in power distribution systems.
10. Describe in detail how electromagnetic induction is utilized in the functioning of AC generators and transformers, including the effects of magnetic flux and coil turns.