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 Electromagnetic Induction Level: High School
A rectangular loop with an area = 0.25 m2 , turns in a uniform magnetic field , B = 3.20 T. When the angle between the normal to the plane of the loop and the field is pi/2 rad and increasing at 1.60 rad/s what is the emf induced in the loop ?
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 Electromagnetic Induction Level: High School
A circular conductor of radius R = 0.250 m is free to rotate about an horizontal as represented in the diagram at ‘click here’ . At time to = 0 , the plane of the loop is horizontal. At time tL = 0.050 s the plane of the loop is vertical . The circuit loop is in a uniform magnetic field magnitude B = 1.250 T directed vertically upward . Determine the following :a) The magnitude of the induced EMF in this loop during this partial rotation .
b) The direction the induced current moves in the loop .
c) The five extra credit points, the average induced current in the loop if resistivity of the wire is ?
P = 0.00750 ohm/ cm .
Physics Electromagnetic Induction Level: High School
A long straight conductor carries a current of l = 10.50 A , as represented in the diagram at ‘click here’ . A rectangular conductor with dimensions l = 2w = 2.25 m is positioned with respect to the current carrying conductors as indicated in the diagram at ‘click here’ . If the current in the long straight conductor goes to zero in a time interval given by delta t = 0.125 s , determine the following .a) The magnitude of the average induced current in the rectangular conductor .
b) The direction in which this induced current will move in the rectangular conductor .
You may treat the B field produced as uniform over the rectangle with a value equal to that at the center of the rectangle .
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
