Because air is a gas
Because air has the highest relative permeability
Because air is a conductor of magnetic flux
Because air has the lowest relative permeability
D. Because air has the lowest relative permeability
2 x 10^-5
2 x 10^-3
2 x 10^5
2 x 10^3
Electromagnetic induction
Mutual induction
Faraday's law
Electromagnetic interference
Reluctivity
Susceptivity
Coercivity
Retentivity
30 ohms
20 ohms
15 ohms
7 ohms
Heinrich Rudolf Hertz
Wilhelm Rontgen
James Clerk Maxwell
Andre Ampere
an unmagnetized iron bar
a magnetized iron bar
a moving electric charge
a stationary electric charge
increases
decreases
remains unchanged
becomes infinite
scalar
phasor
vector
variable
Wartheim effect
Wiedemann effect
Wiegand effect
Edison effect
The current flow through space around a permanent magnet
The force set up when current flows through a conductor
The force that drives current through a resistor
The force between the plates of a charged capacitor
Magnetism
Electromagnetism
Electrical engineering
Electronics engineering
8 × 10^6 N
9 × 10 ^9 N
10^6 N
5 × 10^6 N
10 Wb
50 T
1000 A t/m
1000,t
Conductor
Semiconductor
Insulator
Semi- insulator
Radiation
Convection
Thermionic emission
Conduction
Skin effect
Magnetic effect
Hall effect
Flywheel Effect
zero
negative
positive
infinite
Glass
Oiled paper
Mica
Air
Dynamic force
Electromotive force
Potential difference
Magnetomotive force
0 0= c^2
0 0= c
1/ 0 0= c
1/ 0 0= c^2
At
At/m
N/Wb
At/Wb
Silicon dioxide is a good
The current carriers in conductors are valence electrons
For conductorsa the valence electron are strongly attracted to the nucleus
The valence electrons are located in the nucleus of an atom
Crystalline solid
Amorphous solid
Polycrystalline solid
Poly amorphous solid
volts/meter
Newton/meter
Newton-meter
Amperes/meter
30o
45 o
90o
depending upon the angle of launch and entry
is zero
is uniform
increases with distance from the axis
decreases with distance from the axis
Least permeability
Low permeability
Moderate permeability
High permeability
creepage
skin effect
surface effect
crosstalk
Mmf
Emf
Farad
Coulomb
causes free electrons to flow
increases the circuit resistance
maintains circuit resistance
is needed to make the circuit complete