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
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 Kinematics Level: High School
A boy standing on a roof of height 22.7 meters , throws two stones . The first is projected with a speed 33.9 at an angle 68 degrees above the horizontal . The second is projected with the same speed at the same angle below the horizontal . Find the distance between the points where they reach the ground . Note : g = 9.81m / s^2 .
Physics Kinematics Level: High School
A particle is projected with an initial speed 47.7 m / s at an angle 68 from the horizontal . Find the speed at the point of maximum height . ( g = 9.81 m / s )
Physics Kinematics Level: High School
A bird moving horizontally at a velocity 16.7 m / s folds its wings and executes a free fall . What would be its speed after 2.4 second (in m / s) ? Note : ( g = 9.81 m / s^2 )
Physics Electromagnetic Induction Level: High School
Derive the equation that relates the total charge Q that flows through a search coil to the magnetic field strength B . The search coil has N turns, each of area A , and the flux through the coil is decreased from its initial max value to zero in a time delta t . The resistance of the coil is R , and the total charge is Q = I delta t , where I is the average current induced by the change in flux .
Physics Magnetism,Magnetic Effects Of Current Level: High School
You are at the center of a current carrying solenoid (#1) . You are experiencing a magnetic field B1. You replace the solenoid with a different solenoid (B) . the cross sectional area of this replacement solenoid #2 is double that of the original solenoid #1 , but angle of the other parameters are the same as those of the original solenoid, including the current . You will experience a magnetic field of ______ due to this replacement solenoid #2 .a) 2 B1
b) 0.5 B1
c) B1
d) 4 B1
e) 0.25 B1
Physics Magnetism,Magnetic Effects Of Current Level: High School
A magnetic field exerts forces on electric charge within the field . Choose one .Can always
Can sometimes
Never
Physics Magnetism,Magnetic Effects Of Current Level: High School
A particle of charge 2.5 x 10^-6C is moving at 500 m/s in a direction 30 degree N of E . at the location of the particle the magnetic field has size 0.4 T . The particle is experiencing an instantaneous magnetic force of 1.71 x 10^-4 Newton’s directed vertically upward . The size of the angle A between the velocity and the magnetic field at the location of the particle is most nearly what ?a) The magnetic field B is directed somewhere between where ?
Physics Magnetism,Magnetic Effects Of Current Level: High School
A north magnetic pole represents :a) the starting point of a magnetic field .
b) the exist point of a magnetic field .
c) or both
Physics Magnetism,Magnetic Effects Of Current Level: High School
A proton is fired with a speed of 1.0 x 10^6 m/s through the parallel-plate capacitor shown in the figure at 'click here'. The capacitor's electric field is E = (1.0 x 10^5 V/m, down)
a) What magnetic field B , both strength and direction, must be applied to allow the proton to pass through the capacitor with no change in speed or direction ?
Physics Current Electricity Level: High School
The switch in the figure which is shown at ‘click here’ has been open for a long time . It is closed at t = 0 s . what is the current through the 20 ohm resistor,a) immediately after the switch is closed ?
b) after the switch has been closed a long time ?
c) immediately after the switch is reopened ?
