Materials and Components Questions

• Lines of magnetic field cannot intersect.
• The equation D = ∈0∈r E refers only to isotropic materials.
• The spin angular momentum along a given direction is either or .
• A dielectric is subjected to alternating field. The dielectric losses are potential to
• The number of tightly bound electrons in silicon atom are
• Electric dipole moment is usually expressed in debye units. Here, 1 debye unit equals
• An electron (charge -e) is rotating in a circular orbit of radius R, around a proton with charge +e at a constant angular velocity ω. The orbital magnetic dipole moment is
• The dielectrics having only one kind of atoms are known as elemental dielectrics.
• A circular sphere mile is the area of cross-section of a wire
• 1 Bohr magneton = .
• Which of the following is used in lightning arresters?
• In its lowest state, the electron is bound to the field of proton by an energy equal to
• As regards ferromagnetic Curie temperature Qf and paramagnetic curie temperature θ
• In a ferromagnetic material, the internal field seen by a dipole is
• In which of the following semiconductor are holes majority carriers
• The law that (where K is thermal conductivity, σ is electrical conductivity and T is absolute temperature) for all metals is equal to a universal constant is known as
• The chemical properties of atoms are determined by all the electrons and their configuration.
• If k is Boltzmann's constant and T is absolute temp, then at room temp.
• From a homogeneous and isotropic dielectric material of dielectric constant ∈r, a small volume element is taken out creating a cavity. The field can be kept homogeneous if Di. (i.e., electric flux density inside the cavity) and D0 (i.e., electric flux density outside the cavity) are such that
• At T = 0, the resistivity of a perfect single crystal of a metal is