Related Questions
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Electric field intensity at a point due to a given charge ______ if the relative permittivity of the medium decreases.
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Materials whose permeabilities are slightly greater than that of free space
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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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Temporary magnets are commonly employed in
C. moving coils loudspeakers
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Back emf refers to the
A. Current equal to the applied emf
C. Current opposing the applied emf
D. Voltage opposing the applied emf
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What is the SI unit of reluctance?
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Electric field intensity is measured in
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If the number of valence electrons of an atom is less than 4a the substance is called
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The resistance of a material is ____________ its area of cross-section.
C. inversely proportional to
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A principle that states that only two electrons with different spins are allowed to exist in a given orbit
B. Pauli exclusion principle
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The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge of 5 Cmoves from A to Ba then energy released as
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Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?
B. Hans Christian Oersted
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Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions
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If the relative permittivity of a material is 10a then its permittivity is
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The electrons in the last orbit of an atom are called _______ electrons.
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The contribution to the ionization in an ionization chamber by electrons liberated from t he walls.
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One farad equals
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When the current flowsa the magnetic field ��. conductor is in what direction?
A. The same as the current direction
B. Opposite the current direction
D. In the direction determined by the left hand rule
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The science of adapting electronics to aerospace flight.
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What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
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How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
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Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required for iron part of a magnetic circuit?
B. Because air has the highest relative permeability
C. Because air is a conductor of magnetic flux
D. Because air has the lowest relative permeability
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Who demonstrated the theory of electromagnetic induction in 1831?
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Flux density is measured in
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Ohm's law cannot be applied to which material?
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Electromotive force in a circuit
A. causes free electrons to flow
B. increases the circuit resistance
C. maintains circuit resistance
D. is needed to make the circuit complete
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The branch of Engineering which deals with the magnetic effect of electric current is known as
C. Electrical engineering
D. Electronics engineering
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A positively charged body has
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The diameter of a hydrogen atom is approximately ______ cm.
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The mass of proton is __________ the mass of an electron.