One ampere- turn is equivalent to _____ gilberts
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If the number of valence electrons of an atom is exactly 4a then the substance is called
When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required…
The unit of flux density is
The hot resistance of an incandescent lamp is about _______ its cold resistance.
The force which set ups or tends to set up magnetic flux in a magnetic circuit
A good conductor has how many valence electrons?
What is the usual value of leakage coefficient for electrical machines?
Three charges of +5 Ca -6 C and +9 C are placed inside a sphere. What is the total flux passing through…
The force acting on a unit n- pole placed at that point is called
Flux density is measured in
Who discovered the most important electrical effects which is the magnetic effect?
Used to maintain strength of magnetic field
The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as
The force between two magnetic poles is _____ the relative permeability of the medium.
Mmf in a magnetic circuit corresponds to _____ in an electric circuit
Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability…
The magnetic field around the conductor is determined by the
Lenz' law states that the direction of the induced emf and hence current
Gases whose particles are charged are known as
Flux linkages equals
The emf induced in a coil due to the changing current of another neighboring coil is called
The tiniest element of matter
Which of the following materials has permeability slightly less than that of free space?
What determines the value of the temperature coefficient of resistance of a material?
If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then…
Electric field intensity is measured in
The resistance of a material is ____________ its area of cross-section.
What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
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