Paramagnetic substance has a relative permeability of
Slightly less than one
Equal to one
Slightly equal to one
Very much greater than one
Correct Answer :
C. Slightly equal to one
Related Questions
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
The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability 100 inserteda the flux density will become
10^-3 Wb/m^2
10^-2 Wb/m^2
10^3 Wb/m^2
0.1 Wb/m^2
Which of the following has the least number of valence electrons?
Conductor
Semiconductor
Insulator
Semi- insulator
This paper does not exhibit electricity because it contains the same number of
protons and electrons
neutrons and electrons
neutrons and positrons
atoms
If the length and area of cross-section of a wire are doubleda then its resistance
becomes four times
becomes sixteen times
remains the same
becomes two times
What is the SI unit of conductance?
Siemens
Mhos
Ohms
1/Ohms
The force which set ups or tends to set up magnetic flux in a magnetic circuit
Dynamic force
Electromotive force
Potential difference
Magnetomotive force
If the relative permittivity of a material is 10a then its permittivity is
4 × 10^7F/m
4 × 10^-6 F/m
8.854× 10^-11 F/m
8.854 × 10^-12 F/m
All matters (gasa liquid and solid) are composed of
Neutrons
Particles
Electrons
Atoms
The quantity 10^6 maxwells is equivalent to one
Weber
Gauss
Gilbert
Tesla
A substance that attracts pieces iron
Conductor
Semiconductor
Magnet
All of the above
Electric field intensity is measured in
volts/meter
Newton/meter
Newton-meter
Amperes/meter
The reluctance of the magnetic circuit is ________ relative permeability of the material comprising the circuit.
directly proportional to
inversely proportional to
independent of
dependent of
Ohm's law cannot be applied to which material?
Copper
Silver
Silicon carbide
Aluminum
The resistivity of a conductor ___________ with an increase in temperature.
increases
decreases
remains the same
becomes zero
There are how many compounds available in nature?
300a000
Unlimited
Which of the following is used by permanent magnets as the magnetic material?
iron
nickel
soft steel
hardened steel
Steel is hard to magnetize because of its
Low permeability
High permeability
High density
High retentivity
The electric flux density is a ________ quantity.
phasor
vector
scalar
variable
What is the SI unit of magnetic flux?
Tesla
Weber
Maxwell
Gauss
The unit of flux density is
Wb/m
Tesla
At/m
N/Wb
When the current flowsa the magnetic field ��. conductor is in what direction?
The same as the current direction
Opposite the current direction
Omnidirectional
In the direction determined by the left hand rule
The emf produced in a wire by its motion across a magnetic field does not depend upon the
Diameter of the wire
Length of the wire
Orientation of the wire
Flux density of the field
Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required for iron part of a magnetic circuit?
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
Electromotive force in a circuit
causes free electrons to flow
increases the circuit resistance
maintains circuit resistance
is needed to make the circuit complete
The force between two magnetic poles is _____ their poles strength.
equal to
directly proportional to
inversely proportional to
directly proportional to the square root of
Which of the following materials has the least hysteresis loop area?
soft iron
silicon steel
hard steel
wrought iron
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
The total number of magnetic lines of force in a magnetic field is called
Magnetic flux
Magnetic flux density
Magnetic flux intensity
Magnetic potential
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