Rochelle salt is a ferroelectric material. True False

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Question
Rochelle salt is a ferroelectric material.
Options
A. True
B. False

Correct Answer

True

Materials and Components problems

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3. Assertion (A): The optical dielectric constant (i.e., ?_r at optical frequencies)of ionic dielectrics is less than static dielectric constant.
Reason (R): At optical frequencies, P_i = 0.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

5. Assertion (A): ?_r can be determined experimentally by measuring the capacitance of a parallel plate capacitor with and without the dielectric.
Reason (R): Capacitance of a parallel plate capacitor = .
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

6. Ferromagnetic materials
Options
A. shows spontaneous magnetisation below a certain temperature
B. have resistivity very high as compared to that of iron
C. can be used even at microwave frequencies
D. all of the above

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