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.Management Sciences
Category: Magnetism and Electromagnetism
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
In the left hand rule, forefinger always represents______________?
A. voltage
B. current
C. magnetic field
D. direction of force on the conductor
Which of the following is a ferromagnetic material ?
A. Tungsten
B. Aluminium
C. Copper
D. Nickel
The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?
A. meter is surrounded by strong magnetic fields
B. a soft iron shielding is used
C. a plastic shielding is provided
D. a shielding of anon-magnetic material is used
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
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
The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is________________?
A. proportional to 7
B. proportional to X
C. proportional to distance between the conductors
D. inversely proportional to I
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