Q. The units of μ₀ and μᵣ are

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

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Q. The classes of solid dielectrics are

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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

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

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

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

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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.

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

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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.

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Q. Ferromagnetic materials

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

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

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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.

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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

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Q. A permeable substance is one

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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

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Q. In carbon resistor colour code, the third band is red. It indicates

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Q. Rochelle salt is a ferroelectric material.

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Q. Paramagnetic materials have permanent magnetic dipoles but interaction between neighbouring dipoles is negligible.

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