74651. Electric dipole moment is expressed in debye unit.
74652. A vacant electronic state moves in the same direction as would a positive charge carrier.
74653. Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.
74654. Many compounds also exhibit semiconducting properties.
74655. For magnetic shielding, we need a ferromagnetic material.
74656. Assertion (A): Electronic polarizability increases as atoms becomes larger.Reason (R): For rare gas, ∈0(∈r - 1) E = Na e, where N is number of atoms/m3 and a e is electronic polarizability of material.
74657. In a metal, the valence electrons
74658. All magnetic materials exhibit the phenomenon of saturation.
74659. In p type semiconductor, the conductivity due to holes is (e = charge on hole, μp = hole mobility, p = hole concentration)
74660. The number of protons in a silicon atom are
74661. The fact that domains exhibits spontaneous magnetisation is
74662. Assertion (A): Hall effect is used to determine whether the semi- conductor is p or n type.Reason (R): Under the influence of field, holes and electrons move in opposite direction.
74663. The most important set of specifications of transformer oil include
74664. Nickel is a non-magnetic material.
74665. With increase in temperature, the electrical conductivity would
74666. An electron for which l = 0 has zero orbital magnetic dipole moment.
74667. The clutch is located between the engine and:
74668. If a small amount of Cu is added to Ni conductor, then
74669. When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.
74670. Assertion (A): If an atom of polarizability a is placed in homogeneous field E, the energy stored is 0.5 a E2.Reason (R): Capacitance of an isolated conducting sphere R in vacuum is 4 p ∈0 R farads.
74671. Which of the following are true for relative dielectric constant? It is dimensionless.It is equal to 1 for vacuum.It is equal to 1 for all substances.
74672. Schrodinger wave equation is partial differential equation.
74673. Hall effect is observed in a specimen (metal or semi- conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is
74674. The capacitance of a capacitor is not affected by
74675. Carbon steel has a residual flux density of 1 Wb/m2.
74676. When an atom of polarizability a is placed in an electric field E, the energy stored in atom is 0.5 a E2.
74677. The charge per proton is
74678. In terms of Planck's constant h, the orbital angular momentum of an electron is
74679. The merger of hole and free electron is called
74680. The magnetic quantum number determines the component of angular momentum along a prescribed direction.
74681. An electron is moving around a proton, in a circle of radius R. If flux density in the region is increased from zero to B, the force on the electron is
74682. Wood is a diamagnetic material.
74683. Curie Weiss law is .
74684. Consider the following materials NickelSilverOxygenAluminium The correct sequence in the order of decreasing permeability is
74685. The unit for mmf is
74686. A magnetic field exists around
74687. A conductor carries 10 A current in + x direction and is lying in a field having a flux density 0.2 T directed along + z direction. The magnitude of force per metre length and direction are
74688. The residual resistivity of a binary alloy at 0 K is
74689. The resistance of a photoconductor
74690. If the number of atoms per unit volume of a monoatomic gas changes, the dielectric constant still remains constant.
74691. The number of protons in a copper atom are
74692. When a material is in superconducting state and a magnetic field is applied
74693. For a diamagnetic material, μr = 1.
74694. We can know the arrangement of atom in a material by studying electron diffraction pattern.
74695. The elements which become superconducting at extremely low temperatures are
74696. Electrical contact materials used in switches, brushes, relay must possess
74697. If μp is permanent dipole moment and T is absolute temperature, the orientation polarization of polyatomic gases is
74698. The phenomenon of dielectric hysteresis occurs with
74699. The induced magnetic dipole moment is independent of the permanent magnetic dipole moment.
74700. The core of a solenoid is made of material of relative permeability μr. A small cavity area dA and length dl is cut in the core. If it is desired that flux density in the cavity should be equal to B0
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