The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as
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The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
One weber of flux is equal to _______ magnetic lines of force.
The temperature coefficient of resistance of semiconductors is
One electron volt (1 eV) is equivalent to _____ joules
Which of the following materials has permeability slightly less than that of free space?
A permanent magnet does not exert a force on
Back emf refers to the
The core of a transformer heats up when its primary is fed from an ac source because of
Electromotive force in a circuit
The magnetic field around the conductor is determined by the
If the value of 25 of a conductor is 1/230 per oCa then the value of 0is
A negatively charge body has
What is the usual value of leakage coefficient for electrical machines?
If the length and area of cross-section of a wire are doubleda then its resistance
Under ordinary conditionsa a body is considered
Materials whose permeabilities are slightly greater than that of free space
A negative ion results when an atom gains an additional
Who developed the electromagnetic theory of light in 1862?
The temperature coefficient of resistance of insulators is
Who demonstrated the theory of electromagnetic induction in 1831?
The force between two magnetic poles is _______ their pole strengths.
The unit of flux is _____ in cgs system.
States that the ratio of the thermal conductivity is proportional to the absolute temperature for all…
Hysteresis is a phenomenon of _________ in a magnetic circuit.
The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…
The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
Lenz's law is the consequence of the law of conservation of
The force between two charges placed a given distance apart ______ as the relative permittivity of the…
The unit of flux density is
The conduction of electricity across the surface of a dielectric is called
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