When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
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If the value of 25 a conductor is 1/255 per oCa then the value of 20is
Which of the following has the least number of valence electrons?
The temperature coefficient of resistance of eureka is
The amount of magnetizing force to counter balance the resid magnetic material is referred to as
A t/m is a unit of
What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
The point in a magnet where the intensity of magnetic lines of force is maximum
The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force…
What is the main advantage of temporary magnets?
The ratio of the permeability of material to the permiabiity of air or vacuum.
The mass of proton is __________ the mass of an electron.
What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two…
Under ordinary conditionsa a body is considered
If the number of valence electrons of an atom is exactly 4a then the substance is called
An atom or a group of atoms that carries a net electric charge.
Refers to the magnetic lines
A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed…
Flux linkages equals
Which of the following is a diamagnetic material?
The net electrical charge in an isolated system remains constant. This is known as
Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability…
What is the value of the absolute permittivity of air?
Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required…
The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
What determines the value of the temperature coefficient of resistance of a material?
One that has magnetic poles produced by internal atomic structure with no external current necessary
The B-H curve for ________ is a straight line passing through the origin.
The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
The force between two magnetic poles is _______ their pole strengths.
If the length and area of cross-section of a wire are doubleda then its resistance
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