The force between two charges placed a given distance apart ______ as the relative permittivity of the medium is increased.
increases
decreases
remains unchanged
becomes infinite
Correct Answer :
B. decreases
Related Questions
When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
Statically induced emf
Mutually induced emf
Self induced emf
Dynamically induced emf
The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as
Retentivity
Reluctivity
Resistivity
Conductivity
The dielectric constant of most materials lies between
1 and 10
10 and 20
20 and 50
50 and 100
__________ is a substance of whose molecules consist of the same kind of atom.
Mixture
Compound
Element
Isotope
Magnetic field intensity is a ________ quantity.
scalar
phasor
vector
variable
A good conductor has how many valence electrons?
All matters (gasa liquid and solid) are composed of
Neutrons
Particles
Electrons
Atoms
The permeability of permalloy is
Very much greater than permeability of air
Slightly greater than permeability of air
Slightly less than permeability of air
Equal to the permeability of air
A law relating between the magnetic and electric susceptibilities and the absolute temperatures which is followed b ferromagnetsa antiferromagnetsa non-polar ferroelectricsa antiferroelectrics and some paramagnets.
Curie's Law
Child's Law
CR Law
Curie-Weiss Law
Steel is hard to magnetize because of its
Low permeability
High permeability
High density
High retentivity
If the value of 0 a conductor is 1/234 per oCa then the value of 18is
1/218 per oC
1/252 peroC
1/272 per oC
1/273 per oC
The straight line passing through the two poles of magnet is called
Real axis
Cartesian axis
Magnetic axis
Imaginary axis
The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
Oppose the change
Aid the change
Either oppose or aid the change
Neither oppose nor aid the change
If the number of valence electrons of an atom is less than 4a the substance is called
a conductor
a semiconductor
an insulator
a superconductor
Materials whose permeabilities are slightly greater than that of free space
Paramagnetic
Non- magnetic
Ferromagnetic
Diamagnetic
Refers to the magnetic lines
Flux
Hysteresis
Current
Magnetomotive force
The greater percentage of materials is _________.
diamagnetic
paramagnetic
ferromagnetic
non-magnetic
If the value of 25 of a conductor is 1/230 per oCa then the value of 0is
1/180 peroC
1/150 per oC
1/280 per oC
1/230 per oC
The ability of a material to conduct magnetic flux through it.
Permittivity
Reluctivity
Conductivity
Permeability
Gases whose particles are charged are known as
Conductors
Insulators
Gaseous Conductors
Plasma
The point in a magnet where the intensity of magnetic lines of force is maximum
Magnetic pole
South pole
North pole
Unit pole
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
A group of magnetically aligned atoms is called
Range
Lattice
Domain
Crystal
What revolves about the positive nucleus in a definite orbit?
Atom
Proton
Electron
Neutron
Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its center under the influence of applied field and other magnets.
Ewing's theory of ferromagnetism
Oersted's ferromagnetism theory
Maxwell's magnetic theory
Ampere's circuital law
Which of the following is a diamagnetic material?
Aluminum
Silver
Air
Cobalt
Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.
Ionic bond
Covalent bond
Metallic bond
Van der Waals bond
Which of the following has the least number of valence electrons?
Conductor
Semiconductor
Insulator
Semi- insulator
How many neutrons does a copper atom have?
Core materials of a good relay have _________ hysteresis loop.
large
narrow
very large
very narrow