Above ferroelectric curie temperature, spontaneous polarization in ferroelectric

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Question
Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.
Options
A. True
B. False

Correct Answer

False

Explanation

Spontaneous polarization vanishes above ferro-electric Curie temperature.

Materials and Components problems

Search Results

1. If e is the charge of an electron, R is the radius of its orbit and ? is the angular velocity of electron, the magnetic dipole moment ?_m of the orbit is |?_m| = e?R².
Options
A. True
B. False

2. Material which lack permanent magnetic dipoles are known as
Options
A. paramagnetic
B. diamagnetic
C. ferromagnetic
D. ferrimagnetic

3. The conductivity of intrinsic semiconductor is given by
Options
A. en_i(?_p - ?_n)
B. en_i(?_p + ?_n)
C. n_i(?_p + ?_n)
D. n_i(?_p?_n)

4. If n denotes principal quantum number, the angular quantum number l = 0, 1... (n - 1).
Options
A. True
B. False

5. For a permanent magnetic material
Options
A. the residual induction and coercive field should be large
B. the residual induction and coercive field should be small
C. area of hysteresis loop should be small
D. initial relative permeability should be high

6. A parallel plate capacitor has its length, width and separation doubled. It fringing effects are neglected, to keep the capacitance same, the dielectric constant must be
Options
A. halved
B. kept the same
C. doubled
D. made 4 times

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