The B-H curve of ________ is not a straight line.
air
wood
silicon steel
soft iron
Correct Answer :
D. soft iron
Related Questions
What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?
Ionic
Covalent
Metallic
Van der Waals
Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions
Ionic bond
Covalent Bond
Electrostatic Bond
Metallic bond
What is the value of the absolute permittivity of air?
8.854 F/m
8.854 × 10^-12 mF/m
8.854× 10^-12 F/m
8.854 × 10^-12 F/m
All magnetic field originates from
moving electric charge
Iron atoms
Magnetic domain
Permanent magnets
What type of bond is formed when there exists some form of collective interactions between the (negatively charged) electrons and (positively charged) nuclei in a solid?
Ionic
Covalent
Metallic
Van der Waals
The magnetic field inside a solenoid
is zero
is uniform
increases with distance from the axis
decreases with distance from the axis
The customary energy unit in atomic and nuclear physics is
Joule
Volt- coulomb
electron-volt
Walt- second
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 simplest type of atom to exist is the ______ atom.
Helium
Hydrogen
Boron
Oxygen
There are how many compounds available in nature?
300a000
Unlimited
The point in a magnet where the intensity of magnetic lines of force is maximum
Magnetic pole
South pole
North pole
Unit pole
The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force is called
Leftover magnetism
Hysteresis
Residual magnetism
Coercivity
What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring atoms or ions?
Crystalline
Amorphous
Polycrystalline
Poly amorphous
A germanium atom has an atomic weight of72. How many neutrons are there?
What is the unit of reluctance?
Maxwell
Gauss
At/Wb
Weber
All matters (gasa liquid and solid) are composed of
Neutrons
Particles
Electrons
Atoms
The B-H curve of ________ is not a straight line.
air
wood
silicon steel
soft iron
Refers to the magnetic lines
Flux
Hysteresis
Current
Magnetomotive force
The ability of a material to conduct magnetic flux through it.
Permittivity
Reluctivity
Conductivity
Permeability
At/m is a unit of
mmf
magnetic force
reluctance
magnetic flux density
The reluctance of a magnetic circuit varies with
length × area
area � length
length � area
length + area
The resistivity of a conductor ___________ with an increase in temperature.
increases
decreases
remains the same
becomes zero
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
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
A test charge means a charge of
-1 C
1 electron
+1 C
-20 C
What is the practical unit of electrical energy?
Watt
Kilowatt-hour
Kilowatt-second
Megawathour
The conduction of electricity across the surface of a dielectric is called
creepage
skin effect
surface effect
crosstalk
Who demonstrated the theory of electromagnetic induction in 1831?
Michael Faraday
Andre Ampere
James Clerk Maxwell
Charles Coulomb
Temporary magnets are commonly employed in
electric instruments
motors
moving coils loudspeakers
magnetos
What is the SI unit of reluctance?
At
At/m
N/Wb
At/Wb