For dielectrics in alternating field, polarizability Î±e is a complex quantity. The imaginary part of Î±e is zero for

Electronics and Communication Engineering (ECE) : Materials and Components - Quiz(MCQ)

Ï‰ = 0

Ï‰ â†’ âˆž

Ï‰ = 0 and Ï‰ â†’ âˆž

Ï‰ = natural frequency Ï‰0

Correct Answer : Option (C) : Ï‰ = 0 and Ï‰ â†’ âˆž

Explanation : Imaginary part of αe is zero for ω = 0 and ω = ∞.

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Magnetic hysteresis phenomenon is explained by

domain rotation

motion of domain walls

motion of domain walls and domain rotation

None of the above

Correct Answer : motion of domain walls and domain rotation

A circular sphere mile is the area of cross-section of a wire

having a radius equal to 1 miles

having a circumference equal to 1 miles

having a circumference equal to 0 miles

having a diameter equal to 1 miles

Correct Answer : having a diameter equal to 1 miles

For small size high frequency coils, the most common core material is

steel

ferrite

air

powdered iron

Correct Answer : air