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Magnetism and Electromagnetism - Interview Questions and Answers

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41. A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
A. 63.38 N/Wb
B. 633.8 N/Wb
C. 6338 N/Wb
D. 63380 N/Wb
Explanation:
42. Ferrites are a sub-group of
A. non-magnetic materials
B. ferro-magnetic materials
C. paramagnetic materials
D. ferri-magnetic materials
Explanation:
43. Susceptibility is positive for
A. non-magnetic substances
B. diamagnetic substances
C. ferromagnetic substances
D. none of the above
Explanation:
44. Out of the following statements, concerning an electric field, which statement is not true ?
A. The electric intensity is a vector quantity
B. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point
C. An electric field is defined as a point in space at which an electric charge would experienc* a force
D. Unit field intensity in the exertion of a force of one newton on a charge of one coulomb
Explanation:
45. Substances which have permeability less than the permeability of free space are known as
A. ferromagnetic
B. paramagnetic
C. diamagnetic
D. bipolar
Explanation:
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