Physics Magnetism,Magnetic Effects Of Current Level: High School
Positively and negatively charged particles are simultaneously “shot” through the magnetic field of figure which is shown at “click here” in the plane of the paper . Which of the following statements is correct ?1) The force exerted on both charges is directed out of the page.
2) The force exerted on both charges is directed into the page.
3) The force exerted on the positively charged particle is directed into the page, and the fore on the negatively charged particle is directed out of the page.
4) The force exerted on the positively charged particle is directed out of the page, and the force exerted on the negatively charged particle is directed into the page.
5) The direction of the forces exerted on the two particles is indeterminate because the value of angle infinite has not been given .
Physics Magnetism,Magnetic Effects Of Current Level: High School
In the mks system what is the unit for magnetomotive force ?1) magnewton
2) ampere-turn
3) gilbert
4) maxwell
Physics Magnetism,Magnetic Effects Of Current Level: High School
In the mks system what is the unit for reluctance ?1) rel.
2) oersted
3) 1/H
4) gauss
Physics Magnetism,Magnetic Effects Of Current Level: High School
Flux lines are1) discrete lines of concentrated magnetic force.
2) used only to describe the direction of a magnetic field.
3) used only to indicate the magnitude of a magnetic field .
4) a tool devised by scientists to aid in analyzing magnetic force.
1) discrete lines of concentrated magnetic force .
4) a tool devised by scientists to aid in analyzing magnetic force .
Physics Magnetism,Magnetic Effects Of Current Level: High School
Calculate the magnitude and direction of the magnetic field at the point C , the common center of the semi-circular arcs AD and HJ in the figure at ‘click here’ . R2 = 7.0 cm, R1 = 4.0 cm and the current i = 250 A . Show your work for all four sections of the wire.
Physics Magnetism,Magnetic Effects Of Current Level: High School
A bar magnet is moving toward a solenoid , as indicated in diagram at ‘click here’ . The solenoid is shown in cross-section . Indicate on the diagram the direction the induced current will move in the solenoid .
Physics Magnetism,Magnetic Effects Of Current Level: High School
A thin conducting rod of mass M = 0.788 kg and length l = 1.125 m is constrained to rotate about a vertical axis that passes through the end of the rod , as represented in the diagram at ‘click here’ . A uniform magnetic field of magnitude B = 1.750 T is directed vertically downward. If the rod rotates at a constant angular speed of omega = 62.83 rad / s , determine the following :a) The average induced EMF in the rod .
b) The polarity of the tips of the rod.
c) For five extra credit points , the magnitude and direction of the equilibrating electric field established in the rod .
Physics Magnetism,Magnetic Effects Of Current Level: High School
A square of side length l = 4.00 m lies in the x-z plane represented in the diagram at ‘click here’. A uniform magnetic field is given byB = 0.866 T i – 0.500 T j + 1.732 T k .
If A = -j , find the magnetic flux through the square. (B does not lie in the plane of the square ! )
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 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 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 magneto motive 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
