The unit of flux is _____ in cgs system.
Tesia
Gilbert
Maxwell
Oersted
Correct Answer :
C. Maxwell
Related Questions
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
The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of magnetizing force?
5 × 10^-5 N/Wb
500 × 10^3 N/Wb
4 × 10^7N/Wb
4 × 10^7N/Wb
The electric flux density is a ________ quantity.
phasor
vector
scalar
variable
The current of electric circuit is analogous to which quantity of a m
Mmf
Flux
Flux density
R eluctivity
Which of the following is a natural magnet?
Steel
Magnesia
Lodestone
S oft iron
Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force
Flux
Flux lines
Flux density
Flux intensity
At/m is a unit of
mmf
magnetic force
reluctance
magnetic flux density
A principle that states that only two electrons with different spins are allowed to exist in a given orbit
Bohr's principle
Pauli exclusion principle
Avogadro's principle
Coulomb's principle
A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material three times as long and twice the cross-sectional area?
30 ohms
20 ohms
15 ohms
7 ohms
The phenomenon by which a subtracts pieces of iron
Magnetism
Electromagnetism
Naturalism
Materialism
Which element has four valence electrons?
Conductor
Insulator
Semiconductor
Semi- insulator
Steel is hard to magnetize because of its
Low permeability
High permeability
High density
High retentivity
What is used as the insulating material or dielectric in an electric ion
Oiled paper
Mica
Paraffin
Tit anate compound
Lenz's law is the consequence of the law of conservation of
Energy
Charge
Field lines
Momentum
Which of the following materials has the highest dielectric strength?
Glass
Oiled paper
Mica
Air
The customary energy unit in atomic and nuclear physics is
Joule
Volt- coulomb
electron-volt
Walt- second
Referred to as the specific reluctance of a material
Resistivity
Reluctivity
Conductivity
Permeability
When the relative permeability of a material is much greater than 1a it is called _______ material.
diamagnetic
ferromagnetic
paramagnetic
non-magnetic
If the magnetic material is located within a coil through which alternating current (60 Hz frequency) flowsa then __________ hysteresis loops will be formed
The emission of electrons from hot bodies is called
Radiation effect
Edison effect
Skin effect
Half effect
One of the common application of an air- cored choke.
Radio frequency
Audio frequency
Power supply
Power transformer
What is the measure of the density and sign of the electric charge at a point relative to that at some time?
Electric potential
Electric charge
Electric current
Electric intensity
What is used as the dielectric material in high voltage transformers?
Mica
Paraffin
Porcelain
Oiled paper
A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.
Kirchhoff's circuital law
Maxwell's circuital law
Ampere's circuital law
Coulomb's circuital law
What is the main advantage of temporary magnets?
The magnetic flux can be changed.
Hysteresis can be decreased.
Magnetic materials can be used.
Abundance of ferromagnetic material that can be temporarily magnetized.
Which of the following is used by permanent magnets as the magnetic material?
iron
nickel
soft steel
hardened steel
The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3a then electric potential at that point will be
63 V
21 V
7 V
42 V
What is the SI unit of magnetic flux?
Tesla
Weber
Maxwell
Gauss
Hydrogen is an example of a _____ material.
Paramagnetic
Diamagnetic
Ferromagnetic
N on- magnetic
Germanium atom has ______ protons and ______ electrons.
32, 32
32, 42
42, 32
34, 34