74451. The real part of complex dielectric constant and tanδ for a dielectric are 2.1 and 5 x 10-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is
74452. A copper atom is neutral. Its core has a net charge of
74453. As the temperature of semiconductor is increased
74454. In anti-ferromagnetic materials, the graph of susceptibility versus temperature shows a sharp maximum at a certain temperature. This temperature is known as
74455. A parallel plate capacitor has area of plate A and plate separation d. Its capacitance is C. A metallic plate P of area A and negligible thickness is added as shown in Figure. The new value of capacitance is
74456. The wavelength of light emitted by GaAs laser is 8670 x 10-10 m. If h = 6.626 x 10-34 Js, velocity of light = 3 x 108 m/s and eV = 1.602 x 10-19 J, the energy gap in GaAs is
74457. Diamagnetic materials do not have permanent magnetic dipoles.
74458. A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of
74459. The direction of force an a conductor carrying current and lying in a magnetic field can be found by using
74460. Assertion (A): Rochelle salt and Barium titanate are both ferroelectric. Reason (R): Ferroelectric materials exhibit hysteresis effect.
74461. The units for electric dipole moment are
74462. The temperature coefficient of resistivity of semiconductors is
74463. Which of the following is used in automatic control of street lights?
74464. A leaky dielectric has ∈r = ∈r' - j∈r". If a field E is applied, the current component in phase with E is proportional to ∈r".
74465. Assertion (A): In ionic dielectrics, P = Pe + Pi.Reason (R): In ionic crystals, permanent electric dipole moment is zero.
74466. The current flow in a semiconductor is due to
74467. Assertion (A): Relative permittivity is determined by the atomic structure of the material.Reason (R): Absolute permittivity is determined by the atomic structure of the material.
74468. Eddy current loss is
74469. The dipole moment per unit volume P as a function of E for an insulator is
74470. A good dielectric should have
74471. Magnetic hysteresis phenomenon is explained by
74472. The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m2) and dT/dx (°C per metre) is
74473. As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = r i + aT, where r i and a are constants and T is absolute temperature. At very low temperatures
74474. Consider the following statement: In case of a superconductor B = 0μr is highdiamagnetism is hightransition temperature varies with isotopic mass. Of the above statements
74475. Assertion (A): In liquids and glassy substances, dielectric losses occur. Reason (R): The orientation polarization in many substances is frequency dependent.
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