Related Questions
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What is the practical unit of electrical energy?
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If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ×10^-8 ?a then its resistivity is
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A magnetic field is
A. The current flow through space around a permanent magnet
B. The force set up when current flows through a conductor
C. The force that drives current through a resistor
D. The force between the plates of a charged capacitor
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Which of the following materials has the least hysteresis loop area?
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The dielectric constant of most materials lies between
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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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Hysteresis loss can be reduced by one of the following.
A. Increasing mmf of the circuit
B. Using material narrow hysteresis loop
C. Using ferromagnetic core
D. Laminating the magnetic circuit
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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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The magnetic field of a bar magnet most closely resembles the magnetic field of
B. a straight current- carrying wire
C. a stream of electrons moving parallel to one another
D. a current- carrying wire loop
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The resistance of a material is ____________ its area of cross-section.
C. inversely proportional to
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This paper does not exhibit electricity because it contains the same number of
B. neutrons and electrons
C. neutrons and positrons
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Hydrogen is an example of a _____ material.
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The K shell or the first shell has how many permissible number of orbiting electrons?
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The evaporation of electrons from a heated surface is called
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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 diameter of a hydrogen atom is approximately ______ cm.
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Germanium atom has ______ protons and ______ electrons.
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The mass of proton is __________ the mass of an electron.
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What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring atoms or ions?
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An effect which is generally used in the gausameter to measure flux density.
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Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force
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The uncharged particles which have no effect on its atomic charge.
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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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If the distance between two magnetic poles decreases by 2 timesa the force between them
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A law that states that the current in a thermionic diode varies directly with the three- halves power of anode voltage and inversely with the square of the distance between the electrodesa provided operating conditions are such that the current is limited only by the space charge.
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Magnetic intensity is a
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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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The air space between poles of magnets
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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 reluctance of a magnetic circuit is not dependent on which of the following?
A. Number of turns of coil
C. Flux density in the circuit