Related Questions
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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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One oersted (Oe) is equivalent to _____ Gb/cm.
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The current of electric circuit is analogous to which quantity of a m
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A magnetic material losses its ferromagnetic properties at a point called
B. Inferred absolute temperature
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Who discovered superconductivity in 1911?
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The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force is called
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Electric lines of force leave or enter the charge surface at an angle of
D. depending upon the angle of launch and entry
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Which of the following is a natural magnet?
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Who discovereda the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?
B. Hans Christian Oersted
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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?
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The unit of flux is _____ in cgs system.
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The electric flux density is a ________ quantity.
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Which of the following statements is TRUE?
A. Silicon dioxide is a good
B. The current carriers in conductors are valence electrons
C. For conductorsa the valence electron are strongly attracted to the nucleus
D. The valence electrons are located in the nucleus of an atom
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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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An atom or a group of atoms that carries a net electric charge.
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If the value of 25 a conductor is 1/255 per oCa then the value of 20is
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When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every _______ revolution
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What determines the atomic number of an element?
B. The number of electrons
C. The number of neutrons
D. The number of neutrons and protons
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The contribution to the ionization in an ionization chamber by electrons liberated from t he walls.
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The simplest type of atom to exist is the ______ atom.
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Permeance is analogous to
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Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its center under the influence of applied field and other magnets.
A. Ewing's theory of ferromagnetism
B. Oersted's ferromagnetism theory
C. Maxwell's magnetic theory
D. Ampere's circuital law
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Materials whose permeabilities are slightly greater than that of free space
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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?
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Electric potential is a _______ quantity.
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A current if flowing east along a power line. If the earth's field is neglecteda the direction of the magnetic field below it is
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Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability of 126 x 10^-6 T/A.t/m
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The reluctance of the magnetic circuit is ________ relative permeability of the material comprising the circuit.
A. directly proportional to
B. inversely proportional to
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The phenomenon by which a subtracts pieces of iron
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What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?