The straight line passing through the two poles of magnet is called
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What revolves about the positive nucleus in a definite orbit?
If you hold the conductor with right hand so that the stretched thumb points in the direction of the…
One oersted (Oe) is equivalent to _____ Gb/cm.
Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
A law that states that the current in a thermionic diode varies directly with the three- halves power…
It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.
Which of the following is a natural magnet?
If the number of valence electrons of an atom is exactly 4a then the substance is called
The dielectric constant of most materials lies between
What is the value of the absolute permittivity of air?
If the distance between two magnetic poles decreases by 2 timesa the force between them
A one cubic cm of copper has how many free electrons at room temperature?
The magnetic field of a magnetized iron bar when strongly heated
A theorem which states that an electric current flowing in a circuit produces a magnetic field at external…
Which of the following is used by permanent magnets as the magnetic material?
As the magnetic intensity decreasesa the relative permeability of a magnetic material
What is the typical saturation flux density for most magnetic materials?
The core of a magnetic equipment uses a magnetic material with
The electric flux density is a ________ quantity.
If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then…
The total number of magnetic lines of force in a magnetic field is called
The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of…
When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force…
Hysteresis is a phenomenon of _________ in a magnetic circuit.
Defined as the flux density produced in it due to its own induced magnetism
One weber of flux is equal to _______ magnetic lines of force.
The emf produced in a wire by its motion across a magnetic field does not depend upon the
Back emf refers to the
Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
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