1. Calculate the intrinsic carrier concentration in germanium at 300 K. Given that me *=1.09 m0, mh *=0.31 m0 and Eg = 0.68 eV. Given T = 300 K, k=1.38×10-23 Jk-1, h=6.626×10-34 Js, m0 = 9.11×10-31 Kg, Eg = 0.68 eV =...
Category - Physics
1. A uniform silver wire has a resistivity of 1.54 × 10-8 Ωm at room temperature, for an electrical field along the wire of 1 V/cm. Compute the drift velocity of electron assuming the there are 5.8 × 1028 Conducting...
1. If an ionic crystal is subjected to an electric field of 1000 V/m and the resulting polarization is 4.3 × 10-8 cm², Calculate the relative permittivity of the crystal. Given E = 1000 V/m, ε0 =8.85×10-12 F/m, P = 4.3 ×...
Ferro-electricity When a dielectric material exhibits electric polarization even in the absence of external field, it is known as ferro-electricity and these materials are termed as ferro-electrics. Ferro-electric Ferro-electrics...
If N be the number of molecules per unit volume and α the molecular polarizability then Total polarization eqn, (10) Further, we know that Lorentz field is given by Substituting the value for E, we have eqn...
When a dielectric material is placed in an external electric field, it exerts a dipole moment in it. The total electric field at the atom site of the dielectric kept in an applied electric field is called the internal field. It...
When a dielectric material is subjected to an alternating field, the polarisation varies with time. The polarization p(t) as a function of time t is given by P(t) = P[1- exp (-t/tr)] where, P is the maximum polarization attained...
When the dielectric material is placed in an electric field, the electric field realigns the dipoles resulting in polarization. Polarization occurs in a dielectric material when it is subjected to an external electric...
Depending on the separation between the centre of gravity of positive charges and the centre of gravity of negative charges, the dielectrics are classified as polar (dipole) dielectrics and non-polar (neutral) dielectrics. Polar...
The dielectric materials may be classified as solid, liquid and gas dielectrics. Solid form In solid form they may be polymeric such as nylon, pvc, rubber, backlite, asbestos and wool or may belong to the ceramic family such...
