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Magnetism and Electromagnetism - Interview Questions and Answers

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11. The materials having low retentivity are suitable for making
A. weak magnets
B. temporary magnets
C. permanent magnets
D. none of the above
Explanation:
12. The force between two long parallel conductors is inversely proportional to
A. radius of conductors
B. current in one conductor
C. product of current in two conduc�tors
D. distance between the conductors
Explanation:
13. The unit of relative permeability is
A. henry/metre
B. henry
C. henry/sq. m
D. it is dimensionless
Explanation:
14. The ratio of intensity of magnetisation to the magnetisation force is known as
A. flux density
B. susceptibility
C. relative permeability
D. none of the above
Explanation:
15. Materials subjected to rapid reversal of magnetism should have
A. large area oiB-H loop
B. high permeability and low hysteresis loss
C. high co-ercivity and high reten-tivity
D. high co-ercivity and low density
Explanation: