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The contribution to the ionization in an ionization chamber by electrons liberated from t he walls.
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A magnetic circuit carries a flux iin the iron part and a fluxgin the air gap. What is the leakage coefficient?
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Electrons at the outer shell are called
C. Semiconductor electrons
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If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa the outstretched thumb will then point the north pole. This is known as
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Electronic current in a wire is the flow of ____________ electrons.
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The air space between poles of magnets
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Used to maintain strength of magnetic field
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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?
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The energy stored in an electrostatic field or electromagnetic field is called
A. Electromagnetic energy
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What is the value of the absolute permittivity of air?
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Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
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A germanium atom has an atomic weight of72. How many neutrons are there?
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The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as
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Which of the following has the highest permeability?
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What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?
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What is used as the dielectric material in high voltage transformers?
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A positively charged body has
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What is the SI unit of specific resistance or resistivity?
A. Ohm-circular mil per inch
B. Ohm-circular mil per foot
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If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's law is about
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The magnetic field of a magnetized iron bar when strongly heated
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What is used as the insulating material or dielectric in an electric ion
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The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab of relative permittivity 5 is placed between the platesa then electric field intensity will be
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Three charges of +5 Ca -6 C and +9 C are placed inside a sphere. What is the total flux passing through the surface of sphere?
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One farad equals
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The conduction of electricity across the surface of a dielectric is called
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If the number of valence electrons of an atom is exactly 4a then the substance is called
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The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given by
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An alloy of 40 percent iron and 60 percent nickel.
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The magnetic materials should have a large hysteresis loss for one of the following applications.
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How many neutrons does a copper atom have?