74401. An electron shell corresponding to principal quantum number n can contain a maximum of
74402. A sheet of bakelite is inserted between the plates of an air capacitor. The capacitance will
74403. The spin angular momentum along a given direction is either or .
74404. Lines of magnetic field cannot intersect.
74405. Assertion (A): Dielectric losses are proportional to tan δ.Reason (R): tan δ = where ∈r' and ∈r" denote the real and imaginary parts of ∈r.
74406. At T = 0, the resistivity of a perfect single crystal of a metal is
74407. In a polyatomic gas, the types of polarization which exist together are
74408. Assertion (A): Metals are better heat conductors than insulators.Reason (R): If is temperature gradient, Q is heat flow density and K is thermal conductivity, then Q = - K (dT/dx).
74409. The number of tightly bound electrons in silicon atom are
74410. Electric dipole moment is usually expressed in debye units. Here, 1 debye unit equals
74411. A particle of charge Q coulombs is bound elastically to an equilibrium position with a force constant of f newton per metre. The polarizability of the system is
74412. 1 Bohr magneton = .
74413. 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
74414. In a virgin specimen of iron, the direction of spontaneous magnetisation varies from domain to domain.
74415. Which of the following is used in lightning arresters?
74416. High frequency inductors and capacitors are commonly plated with silver. The main purpose of this is to
74417. In its lowest state, the electron is bound to the field of proton by an energy equal to
74418. In a ferromagnetic material, the internal field seen by a dipole is
74419. The iron core of a coil is removed so that it becomes an air cored coil. Its inductance will
74420. A circular sphere mile is the area of cross-section of a wire
74421. In an hydrogen atom, an electron moves in the field of a proton. The stability of orbit requires equilibrium between coulomb's force and centrifugal force.
74422. For small size high frequency coils, the most common core material is
74423. The orientation polarization of a polyatomic gas is inversely proportional to absolute temperature.
74424. Assertion (A): Intrinsic resistivity of silicon is lower than that of germanium.Reason (R): Magnitude of free electron concentration in germanium is more than that of silicon.
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