A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
Avogadro's number
Planck's constant
Boltzmann's constant
Madelung constant
Correct Answer :
D. Madelung constant
Related Questions
A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 × 10^-6
5 × 10^-6
500 × 10^-6
500 × 10^-5
What is the unit of magnetomotive force?
Volt
Tesla
Ampere- turn
Weber
The temperature coefficient of resistance of eureka is
p ositive
negative
almost zero
i nfinite
The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing it
Magnetic Reluctivity
Magnetic Resistivity
Magnetic susceptibility
Magnetic conductivity
The uncharged particles which have no effect on its atomic charge.
Nucleons
Electrons
Protons
Neutrons
Lenz's law is the consequence of the law of conservation of
Energy
Charge
Field lines
Momentum
If the distance between two magnetic poles decreases by 2 timesa the force between them
decreases two times
increases four times
increases two times
decreases four times
The core of a transformer heats up when its primary is fed from an ac source because of
permeability
ferromagnetism
reluctance of core
hysteresis loss
Back emf refers to the
Current equal to the applied emf
Opposing emf
Current opposing the applied emf
Voltage opposing the applied emf
Germanium atom has ______ protons and ______ electrons.
32, 32
32, 42
42, 32
34, 34
Gases whose particles are charged are known as
Conductors
Insulators
Gaseous Conductors
Plasma
Three charges of +5 Ca -6 C and +9 C are placed inside a sphere. What is the total flux passing through the surface of sphere?
8 C
14 C
20 C
-6 C
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
Which of the following materials has permeability slightly less than that of free space?
Paramagnetic
Non- magnetic
Ferromagnetic
Diamagnetic
As the magnetic intensity decreasesa the relative permeability of a magnetic material
decreases
remains the same
increases
becomes zero
Electric field intensity is a ________.
scalar
phasor
vector
variable
Materials whose permeabilities are slightly greater than that of free space
Paramagnetic
Non- magnetic
Ferromagnetic
Diamagnetic
What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
What determines the value of the temperature coefficient of resistance of a material?
length
cross-sectional area
volume
nature and temperature
The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force is called
Leftover magnetism
Hysteresis
Residual magnetism
Coercivity
Ohm's law cannot be applied to which material?
Copper
Silver
Silicon carbide
Aluminum
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
The mass of proton is __________ the mass of an electron.
equal to
about 1837 times
less than
200 tim es
Hysteresis loss can be reduced by one of the following.
Increasing mmf of the circuit
Using material narrow hysteresis loop
Using ferromagnetic core
Laminating the magnetic circuit
The magnetic potential in a magnetic circuit can be measured in terms of
Mmf
Emf
Farad
Coulomb
The electrons in the last orbit of an atom are called _______ electrons.
free
valence
bound
thermionic
Hipernik is an alloy containing __________ iron and __________ nickel.
40% ; 60%
60% ; 40%
50% ; 50%
70% ; 30%
The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given by
0 0= c^2
0 0= c
1/ 0 0= c
1/ 0 0= c^2
The lagging effect between flux density of the material and the magne
Permeance
Eddy current
Hysteresis
R eluctance
An electron- volt (eV) is a unit of
Energy
Potential difference
Charge
Momentum