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Magnetism and Electromagnetism - Interview Questions and Answers

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56. Magnetising steel is normals difficult because
A. it corrodes easily
B. it has high permeability
C. it has high specific gravity
D. it has low permeability
Explanation:
57. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?
A. 2 AT
B. 4 AT
C. 6 AT
D. 10 AT
Explanation:
58. The materials are a bit inferior conductors of magnetic flux than air.
A. ferromagnetic
B. paramagnetic
C. diamagnetic
D. dielectric
Explanation:
59. The magneto-motive force is
A. the voltage across the two ends of exciting coil
B. the flow of an electric current
C. the sum of all currents embraced by one line of magnetic field
D. the passage of magnetic field through an exciting coil
Explanation:
60. How does the magnetic compass needle behave in a magnetic field ?
A. It assures a position right angle to magnetic field
B. It starts rotating
C. It assures a position which follows a line of magnetic flux
D. None of the above
Explanation: