magnetic circuits flux mmf reluctance electromagnetic induction self mutual induction - Question Bank
1. The induced voltage in a moving conductor is given by v = Blv, where B is the magnetic flux density, l is the length of the conductor, and v is the velocity. This is a direct application of:
2. What is the condition for resonance in an RLC circuit, which involves magnetic and electric fields?
3. The magnetic flux density in a material is the sum of the magnetic field intensity and the:
4. If two coils have inductances L1 and L2 and are wound on a common core with coefficient of coupling k, their equivalent inductance when connected in series aiding is:
5. The ratio of magnetic flux (Φ) to MMF is:
6. Which law is used to determine the direction of the induced EMF?
7. What is the unit of magnetic flux linkage?
8. If the reluctance of a magnetic circuit increases, and MMF is constant, the magnetic flux will:
9. The property of a material that opposes the change of magnetic flux is:
10. For a toroidal coil with N turns, a core length of l, and cross-sectional area A, carrying current I, the MMF is approximately:
11. Eddy currents are induced in:
12. The relationship M = k * sqrt(L1 * L2) defines:
13. Which of the following is NOT a unit of magnetic flux?
14. If the flux in a magnetic circuit remains constant, but the current in the coil producing it changes, what is the induced EMF?
15. The reluctance of a magnetic circuit depends on:
16. A changing current in coil 1 induces an EMF in coil 2. This is an example of:
17. The phenomenon of electromagnetic induction is fundamentally described by:
18. If a coil has an inductance of 10 H and carries a current of 2 A, the magnetic flux linkage is:
19. Which of the following statements about Faraday's Law is correct?
20. The term 'air gap' in a magnetic circuit typically implies:
21. What is the relationship between magnetic field intensity (H) and magnetic flux density (B) in a linear magnetic medium?
22. In a series magnetic circuit, the total reluctance is:
23. Magnetic flux linkage is defined as:
24. The unit of magnetic field intensity (H) is:
25. For a magnetic circuit made of a material with high permeability, the reluctance will be:
26. A changing magnetic field can induce an electric field. This is the principle behind:
27. When magnetic flux passes through a core material, the material's property that facilitates this passage is called:
28. If k = 1 for two coils, it means there is:
29. The coefficient of coupling (k) between two coils is a measure of:
30. Which of the following factors affects the self-inductance of a coil?
31. The energy stored in an inductor is given by the formula:
32. The induced EMF in a coil is proportional to the rate of change of:
33. If the number of turns in a coil is doubled, and the current remains the same, the MMF produced will:
34. What is the unit of magnetic flux density?
35. The magnetic flux density (B) is defined as:
36. Permeability of a material is analogous to which property of an electric circuit?
37. Which property of a material opposes the establishment of magnetic flux within it?
38. For a given magnetic circuit, if the MMF is doubled and the reluctance is halved, the magnetic flux will:
39. What is the unit of inductance (both self and mutual)?
40. The coefficient of mutual inductance (M) between two coils is defined as the ratio of:
41. The coefficient of self-inductance (L) of a coil is defined as the ratio of:
42. Mutual induction occurs when a changing current in one coil induces an EMF in:
43. Self-induction is the phenomenon where a changing current in a coil induces an EMF in:
44. What is the unit of reluctance?
45. Lenz's Law is a consequence of the conservation of:
46. Which law states that a voltage is induced in a conductor when it is exposed to a changing magnetic field?
47. What does MMF stand for in the context of magnetic circuits?
48. Reluctance of a magnetic circuit is analogous to which property of an electric circuit?
49. The magnetic equivalent of Ohm's law in an electric circuit is:
50. What is the unit of magnetic flux?