Magnetic field intensity is a ________ quantity.
scalar
phasor
vector
variable
Correct Answer :
C. vector
Related Questions
Calculate the permeability (in T/A. t/m) of a magnetic material that has a relative permeability of 300
3.78 x 10^4
3.78 x 10^-5
3.78 x 10^-3
3.78 x 10^-6
The force between two magnetic poles varies with the distance between them. The variation is ______ to the square of that distance.
Equal
Greater than
Directly proportional
Inversely proportional
The reluctance of a magnetic circuit varies with
length × area
area � length
length � area
length + area
A good conductor has how many valence electrons?
Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force
Flux
Flux lines
Flux density
Flux intensity
What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as
Hall effect
Grounding
Shielding
Limiting
Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field intensity is
Minimized
Reduced to zero
Maximize
Unity
Electron is a Greek word for
amber
Fire
Stone
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The resistance of a material is ____________ its area of cross-section.
directly proportional
independent of
inversely proportional to
equal to
It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.
R esistance
Conductance
Permeance
I nductance
The magnetic energy stored in an inductor is ______ current.
Directly proportional to
Inversely proportional to
Directly proportional to the square of
Inversely proportional to the square of
If a 20 V potential is applied across a relay coil with 50 turns having 1 ? of resistancea the total magnetomotive producing magnetic flux in the circuit is
10 Wb
50 T
1000 A t/m
1000,t
An effect which is generally used in the gausameter to measure flux density.
Skin effect
Magnetic effect
Hall effect
Flywheel effect
When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every _______ revolution
The B-H curve for ________ is a straight line passing through the origin.
cobalt
air
hardened steel
soft iron
Define as that pole which when placed in air from a similar and equal pole repels it with a force of newtons
North pole
South pole
Unit pole
Magnetic pole
Electromotive force in a circuit
causes free electrons to flow
increases the circuit resistance
maintains circuit resistance
is needed to make the circuit complete
How many electrons are needed in the valence orbit to give a material's stability?
Which of the following is a natural magnet?
Steel
Magnesia
Lodestone
S oft iron
A negatively charge body has
deficit of electrons
excess of protons
excess of electrons
deficit of neutrons
There are how many compounds available in nature?
300a000
Unlimited
What is the practical unit of electrical energy?
Watt
Kilowatt-hour
Kilowatt-second
Megawathour
Which of the following materials has the highest dielectric strength?
Glass
Oiled paper
Mica
Air
The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
Leakage flux
Leakage current
Leakage coefficient
Leakage factor
The force acting on a unit n- pole placed at that point is called
Magnetic field intensity
Electric field intensity
Electromagnetic field intensity
Intensity magnetization
The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge of 5 Cmoves from A to Ba then energy released as
5 joules
25 joules
10 joules
100 joules
Refers to the magnetic lines
Flux
Hysteresis
Current
Magnetomotive force
The science of adapting electronics to aerospace flight.
Avionics
Aerotronics
Aerodynamics
Astrionics
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Right hand rule
Left hand rule
Cork screw rule
End Rule