Which of the following has the least number of valence electrons?
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An atom or a group of atoms that carries a net electric charge.
It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.
Electrons at the outer shell are called
The magnetic flux through a wire loop in a magnetic field does not d
Electronic current in a wire is the flow of ____________ electrons.
Which of the following is a vector quantity?
The reluctance of the magnetic circuit is ________ relative permeability of the material comprising…
When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
The reluctance of a magnetic circuit varies with
When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about…
Permanent magnets can be found in
The customary energy unit in atomic and nuclear physics is
When the relative permeability of a material is slightly more than 1a it is called ______ material.
If the number of valence electrons of an atom is less than 4a then the substance is probably
A test charge means a charge of
Which of the following is a natural magnet?
The point in a magnet where the intensity of magnetic lines of force is maximum
The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…
A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
The temperature coefficient of resistance of eureka is
A good conductor has how many valence electrons?
The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability…
The emission of electrons from hot bodies is called
The emf induced in a coil due to the changing current of another neighboring coil is called
What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring…
The hot resistance of an incandescent lamp is about _______ its cold resistance.
The magnetic field of a magnetized iron bar when strongly heated
If the number of valence electrons of an atom is more than 4a the substance is called
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