Q. The attraction between the nucleus and valence electron of copper atom is

View solution

Q. If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then

View solution

Q. There is no hysteresis phenomenon is any dielectric material.

View solution

Q. The units of μ₀ and μᵣ are

View solution

Q. In metals the valence electron wave functions are strongly perturbed by the presence of neighbouring atoms.

View solution

Q. The classes of solid dielectrics are

View solution

Q. A 200 turn coil has a self inductance of 10 mH. If the number of turns is doubled, all other quantities remaining the same, the self inductance will be

View solution

Q. A material which is lightly repelled by a magnetic field is known as

View solution

Q. Which of the following is the poorest conductor of electricity?

View solution

Q. The magnetic moment in units of Bohr magneton of a ferrous ion in any ferrite is

View solution

Q. Assertion (A): The optical dielectric constant (i.e., εr at optical frequencies)of ionic dielectrics is less than static dielectric constant.

Reason (R): At optical frequencies, Pi = 0.

View solution

Q. A piece of iron is placed in a magnetic field

View solution

Q. Assertion (A): Magnetism can be explained by the theory of magnetic domains.

Reason (R): The existence of magnetic domains is evident from the Bitter powder patterns.

View solution

Q. Ferromagnetic materials

View solution

Q. In a specimen of ferromagnetic material, as the flux density is increased from zero to 2.5 T, µᵣ will

View solution

Q. In molecules of ionic crystals, orientation polarization is zero.

View solution

Q. Assertion (A): CO₂ has no resultant dipole moment but CO has a dipole moment.
Reason (R): The structure of CO₂ is O = C = O.

View solution

Q. For a photoconductor with equal electron and hole mobilities and perfect ohmic contacts at the ends, an increase in intensity of optical illumination results in

View solution

Q. A permeable substance is one

View solution

Q. When subjected to alternating stresses, an insulating material is characterised by complex dielectric constant ∈'r - j∈"r . In such materials, the dielectric losses under alternating stress is proportional

View solution