A. change the direction of magnetic lines
B. amplify flux
C. restore lost flux
D. provide a closed path for flux
Related Mcqs:
- 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 conductors
D. distance between the conductors - Which of the following statements is correct ?
A. The conductivity of ferrites is better than ferromagnetic materials
B. The conductivity of ferromagnetic materials is better than ferrites
C. The conductivity of ferrites is very high
D. The conductivity of ferrites is same as that of ferromagnetic materials - For which of the following materials the saturation value is the highest ?
A. Ferromagnetic materials
B. Paramagnetic materials
C. Diamagnetic materials
D. Ferrites - The uniform magnetic field is______________?
A. the field of a set of parallel conductors
B. the field of a single conductor
C. the field in which all lines of magnetic flux are parallel and equidistant
D. none of the above - he retentivity (a property) of material is useful for the construction of__________?
A. permanent magnets
B. transformers
C. non-magnetic substances
D. electromagnets - The unit of flux is the same as that of_______________?
A. reluctance
B. resistance
C. permeance
D. pole strength - Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be_____________?
A. 100 N
B. 10 N
C. 1 N
D. 0.1 N - Reciprocal of permeability is____________?
A. reluctivity
B. susceptibility
C. permittivity
D. conductance - Paramagnetic materials have relative permeability________________?
A. slightly less than unity
B. equal to unity
C. slightly more than unity
D. equal to that ferromagnetic mate rials - The materials having low retentivity are suitable for making_____________?
A. weak magnets
B. temporary magnets
C. permanent magnets
D. none of the above
