Related Questions
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The force which set ups or tends to set up magnetic flux in a magnetic circuit
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What revolves about the positive nucleus in a definite orbit?
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A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
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An effect which is generally used in the gausameter to measure flux density.
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Who discovered superconductivity in 1911?
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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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Refers to the non- metallic materials that have the ferromagnetic properties of iron.
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If the relative permittivity of a material is 10a then its permittivity is
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A germanium atom has an atomic weight of72. How many neutrons are there?
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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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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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What is the cgs unit of magnetomotive force?
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The property of a material which opposes the creation of magnetic flux in it
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Lenz's law is the consequence of the law of conservation of
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Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.
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Permanent magnets can be found in
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What is the unit of reluctance?
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Which of the following is a diamagnetic material?
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The direction of force o a current carrying conductor placed in a m found by
B. Fleming's left hand rule
C. Fleming's right hand rule
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The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3a then electric potential at that point will be
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Flux linkages equals
A. Flux times area of core
B. Flux times number of turns times area of core
C. Flux times number of turns times length of core
D. Flux times number of turns
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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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Germanium atom has ______ protons and ______ electrons.
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The science of adapting electronics to aerospace flight.
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Electrons at the outer shell are called
C. Semiconductor electrons
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Gases whose particles are charged are known as
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Which of the following magnetic materials can be easily magnetized in both direction?
A. Soft magnetic materials
B. Hard magnetic materials
C. High hysteresis loss materials
D. Low hysteresis loss materials
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The core of a transformer heats up when its primary is fed from an ac source because of
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The magnetic field inside a solenoid
C. increases with distance from the axis
D. decreases with distance from the axis
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Magnetic effects of the earth as a huge magnet with north and south poles.
D. Terrestrial ferromagnetism