magnetic circuits flux mmf reluctance electromagnetic induction self mutual induction - One Line Questions

1. The energy stored in an inductor is given by the formula: — 1/2 * L * I^2
2. If a coil has an inductance of 10 H and carries a current of 2 A, the magnetic flux linkage is: — 20 Weber-turns
3. The term 'air gap' in a magnetic circuit typically implies: — A region of low permeability (like air) inserted into the magnetic path
4. What is the unit of magnetic flux? — Weber
5. The unit of magnetic field intensity (H) is: — Ampere-turn/meter
6. Which law states that a voltage is induced in a conductor when it is exposed to a changing magnetic field? — Faraday's Law of Electromagnetic Induction
7. Which law is used to determine the direction of the induced EMF? — Lenz's Law
8. 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: — Faraday's Law of Induction
9. Self-induction is the phenomenon where a changing current in a coil induces an EMF in: — The same coil
10. What is the relationship between magnetic field intensity (H) and magnetic flux density (B) in a linear magnetic medium? — B = μ * H
11. Lenz's Law is a consequence of the conservation of: — Energy
12. Reluctance of a magnetic circuit is analogous to which property of an electric circuit? — Resistance
13. The property of a material that opposes the change of magnetic flux is: — Reluctance
14. The induced EMF in a coil is proportional to the rate of change of: — Flux linkage
15. A changing magnetic field can induce an electric field. This is the principle behind: — Electromagnetic induction
16. What is the unit of inductance (both self and mutual)? — Henry
17. The magnetic equivalent of Ohm's law in an electric circuit is: — Flux = MMF / Reluctance
18. The coefficient of mutual inductance (M) between two coils is defined as the ratio of: — Flux linkage in one coil to current in the other coil
19. The coefficient of self-inductance (L) of a coil is defined as the ratio of: — Flux linkage to current
20. If the number of turns in a coil is doubled, and the current remains the same, the MMF produced will: — Double
21. For a magnetic circuit made of a material with high permeability, the reluctance will be: — Low
22. If the reluctance of a magnetic circuit increases, and MMF is constant, the magnetic flux will: — Decrease
23. Eddy currents are induced in: — Conducting materials subjected to changing magnetic fields
24. Which of the following statements about Faraday's Law is correct? — It relates the induced EMF to the rate of change of magnetic flux.
25. 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: — L1 + L2 + 2k * sqrt(L1*L2)
26. What does MMF stand for in the context of magnetic circuits? — Magnetomotive Force
27. The magnetic flux density in a material is the sum of the magnetic field intensity and the: — Magnetization vector (M)
28. If the flux in a magnetic circuit remains constant, but the current in the coil producing it changes, what is the induced EMF? — Zero
29. The phenomenon of electromagnetic induction is fundamentally described by: — Maxwell's Equations
30. For a toroidal coil with N turns, a core length of l, and cross-sectional area A, carrying current I, the MMF is approximately: — N * I
31. If k = 1 for two coils, it means there is: — Perfect magnetic coupling
32. Which of the following factors affects the self-inductance of a coil? — Number of turns, core material, and geometry
33. Which property of a material opposes the establishment of magnetic flux within it? — Reluctance
34. The ratio of magnetic flux (Φ) to MMF is: — Permeance
35. For a given magnetic circuit, if the MMF is doubled and the reluctance is halved, the magnetic flux will: — Quadruple
36. Permeability of a material is analogous to which property of an electric circuit? — Conductivity
37. When magnetic flux passes through a core material, the material's property that facilitates this passage is called: — Permeability
38. A changing current in coil 1 induces an EMF in coil 2. This is an example of: — Mutual induction
39. The reluctance of a magnetic circuit depends on: — Both (a) and (b)
40. Mutual induction occurs when a changing current in one coil induces an EMF in: — An adjacent coil
41. In a series magnetic circuit, the total reluctance is: — The sum of individual reluctances
42. The relationship M = k * sqrt(L1 * L2) defines: — The mutual inductance between two coils
43. The coefficient of coupling (k) between two coils is a measure of: — The ratio of mutual inductance to the geometric mean of self-inductances
44. The magnetic flux density (B) is defined as: — Magnetic flux per unit area
45. Magnetic flux linkage is defined as: — Magnetic flux multiplied by the number of turns
46. What is the unit of magnetic flux density? — Tesla
47. Which of the following is NOT a unit of magnetic flux? — Tesla
48. What is the unit of magnetic flux linkage? — Weber-turn
49. What is the unit of reluctance? — Ampere-turn/Weber
50. What is the condition for resonance in an RLC circuit, which involves magnetic and electric fields? — XL = XC
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