Physics Magnetism,Magnetic Effects Of Current Level: High School
The magnetic characteristics of a core material are shown in the figure at “click here”. What change in magnetizing force is required to reserve the direction of the magnetic field from saturation in the positive direction to saturation in the negative direction ?a) 110 At/m
b) 140 At/m
c) 180 At/m
d) 220 At/m
Physics Magnetism,Magnetic Effects Of Current Level: High School
The magnetic characteristics of a core material are shown in the figure at “click here”. What is the change in magnetizing force is required to decrease the flux density of the magnetic material from saturation in the positive direction to zero ?a) 88 At/m
b) 110 At/m
c) 132 At/m
d) None of the above
Physics Magnetism,Magnetic Effects Of Current Level: High School
Hysteresis Curve
The magnetic characteristics of a core material are shown in the figure at “click here”. What is the magnitude of the coercive force of the core material ?a) 12 At/m
b) 22 At/m
c) 28 At/m
d) 35 At/m
Physics Magnetism,Magnetic Effects Of Current Level: High School
The magnetic characteristics of a core material are shown in the figure at “click here” . which one of the following could be an approximate relative permeability of the material ?a) 13000
b) 40000
c) 51000
d) 76000
Physics Magnetism,Magnetic Effects Of Current Level: High School
The mks unit for energy density is the ?a) weber per square meter.
b) weber-ampere-turn per square meter.
c) ampere-turn per cubic meter.
d) joule per cubic meter.
Physics Magnetism,Magnetic Effects Of Current Level: High School
All ferromagnetic materials have nonlinear magnetic characteristics.a) True
b) False
Physics Magnetism,Magnetic Effects Of Current Level: High School
A core material has a relative permeability of 150000 . A magnetizing force is applied to the core and produces a flux density of 1.1 Wb/m^2 .If the magnetic path is 34.3 m long , what is the magnetomotive force to the core ? (Assume no air gap, and convert inches to meters)a) 5.09 At
b) 15.9 At
c) 200 At
d) 226 At
Physics Magnetism,Magnetic Effects Of Current Level: High School
A core material has a relative permeability of 150000 . A magnetizing force is applied to the core and produces a flux density of 1.1 Wb/m^2 . What is the value of the magnetizing force ?a) 3.77 At/m
b) 5.84 At/m
c) 18.3 At/m
d) 23.4 At/m
Physics Magnetism,Magnetic Effects Of Current Level: High School
Magnetizing force (magnetic field strength) and magnetomotive force are identical quantities .a) True
b) False
Physics Magnetism,Magnetic Effects Of Current Level: High School
A certain core material has an actual permeability of 4.40 x 10^-2 H/m. What is the relative permeability of the material ?a) 35000
b) 176000
c) 140000
d) 552000
Physics Magnetism,Magnetic Effects Of Current Level: High School
The mks unit of magnetizing force is the ?a) ampere-turn per meter.
b) gausss
c) oersted
d) weber per square meter
Physics Magnetism,Magnetic Effects Of Current Level: High School
Which type of magnetic material would you choose to use as a shield for a meter movement ? The shield is to short-circuit the flux around the movement.a) Paramagnetic
b) Diamagnetic
c) Ferromagnetic
Physics Magnetism,Magnetic Effects Of Current Level: High School
A core of magnetic material is of constant cross-sectional area and has a short air gap . A magnetomotive force is applied , and it produces a flux in the series magnetic path but does not saturate the core . The flux density of the magnetic path.a) is always the same in the air gap as in the iron .
b) will probably be somewhat greater in the air gap than in the iron .
c) will probably be somewhat less in the air gap .
d) will probably be much less in the air gap .
Physics Magnetism,Magnetic Effects Of Current Level: High School
In the mks system the correct unit for flux density is ?1) Webers
2) Webers/meter^2
3) maxwells / centimeter^2
4) none of the above
Physics Magnetism,Magnetic Effects Of Current Level: High School
In the mks system what is the unit for permeability ?1) flux/meter
2) henrys/meter
3) ampere-turns/m^3
4) ampere-turns/Weber.