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Magnetism and Electromagnetism - Interview Questions and Answers

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61. The relative permeability of materials is not constant.
A. diamagnetic
B. paramagnetic
C. ferromagnetic
D. insulating
Explanation:
62. The retentivity (a property) of material is useful for the construction of
A. permanent magnets
B. transformers
C. non-magnetic substances
D. electromagnets
Explanation:
63. The stray line of magnetic flux is defined as
A. a line vertical to the flux lines
B. the mean length of a ring shaped coil
C. a line of magnetic flux in a non-uniform field
D. a line of magnetic flux which does not follow the designed path
Explanation:
64. The magnetic reluctance of a material
A. decreases with increasing cross sectional area of material
B. increases with increasing cross-sec-tional area of material
C. does not vary with increasing cross-sectional area of material
D. any of the above
Explanation:
65. The initial permeability of an iron rod is
A. the highest permeability of the iron rod
B. the lowest permeability of the iron rod
C. the permeability at the end of the iron rod
D. the permeability almost in non-magnetised state
Explanation:
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