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.Management Sciences
Category: Magnetism and Electromagnetism
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle?
A. will be zero
B. will be infinite
C. will depend on the amount of e.m.f. applied
D. will depend on the radius of the circle
Gilbert is a unit of_______________?
A. electromotive force
B. magnetomotive force
C. conductance
D. permittivity
A keeper is used to_____________?
A. change the direction of magnetic lines
B. amplify flux
C. restore lost flux
D. provide a closed path for flux
Magnetism of a magnet can be destroyed by_____________?
A. heating
B. hammering
C. by inductive action of another magnet
D. by all above methods
Fleming’s left hand rule is used to find_________________?
A. direction of magnetic field due to current carrying conductor
B. direction of flux in a solenoid
C. direction of force on a current carrying conductor in a magnetic field
D. polarity of a magnetic pole
The bar magnet has____________?
A. the dipole moment
B. monopole moment
C. A. and B. both
D. none of the above
The materials having low retentivity are suitable for making_____________?
A. weak magnets
B. temporary magnets
C. permanent magnets
D. none of the above
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