Q. Assertion (A): Both sodium and ferrous are ferromagnetic.

Reason (R): Both sodium and ferrous have body centred cubic structure.

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Q. For iron, the ferromagnetic Curie temperature is

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Q. The probability of recombination of electrons and holes in a semiconductor is proportional to

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Q. Assertion (A): The regular or irregular stacking of atoms has importanteffect on properties of materials.

Reason (R): The arrangement of atoms in a given material can be studied using X-rays.

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Q. If temperature is increased, the temperature coefficient of a metal

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Q. The application of magnetic field to superconducting material

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Q. Automobile ignition systems use the principle of

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Q. If ω₀ is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ω, when a magnetic field B is acting is ω ≅ ω₀ + (e/2m)B.

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Q. The resistance of a superconductor is

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Q. Dielectric constant, under the condition of alternating fields, is a complex quantity.

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Q. In an homogeneous dielectric subjected to an electric field E, the dipole moment per unit volume is ∈₀(∈ᵣ - 1) E.

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