Discussion
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- Question
For dielectrics in alternating field, polarizability ae is a complex quantity. The imaginary part of ae is zero for
Options- A. ? = 0
- B. ? ? ?
- C. ? = 0 and ? ? ?
- D. ? = natural frequency ?0
- Correct Answer
- ? = 0 and ? ? ?
ExplanationImaginary part of ae is zero for ? = 0 and ? = ?.
Materials and Components problems
Search Results
- 1. When a trivalent impurity is added, the semiconductor becomes
Options- A. p type
- B. n type
- C. intrinsic
- D. neutral Discuss
Correct Answer: p type
- 2. When two conductors carry currents in the same direction the force is repulsive.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
The force is attractive.- 3. The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about
Options- A. sign of charge carrier
- B. density of charge carrier
- C. both sign and density of charge carrier
- D. none of the above Discuss
Correct Answer: both sign and density of charge carrier
- 4. If the operating temperature increases by 10°C, the rate of deterioration of solid dielectric becomes
Options- A. double
- B. one and a half time
- C. 3 times
- D. 4 times Discuss
Correct Answer: double
- 5. A metal has a large number of free electrons. If e is electronic charge and m is mass of electron and an electric field E is applied along (say) x direction, the electrons acquire a velocity having a component vx is x direction. Then
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 6. Bitter powder patterns prove the existence of domains.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. Assertion (A): If an electron having charge e is revolving in an orbit of radius R and with angular velocity ?, the magnetic dipole moment of orbit is 0.5 e?R2.
Reason (R): Orbital angular momentum and magnetic dipole moment are always equal.
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 Discuss
Correct Answer: A is true but R is false
Explanation:
Orbital angular momentum and magnetic dipole moment are not equal.- 8. For making a capacitor it is better to have a dielectric having
Options- A. high permittivity
- B. low permittivity
- C. permittivity same as that of air
- D. permittivity which is neither high nor low Discuss
Correct Answer: high permittivity
Explanation:
Capacitance is directly proportional to permittivity.- 9. Assertion (A): The angular momentum of an atom is due to three contributions viz. orbital, electron spin and nuclear spin.
Reason (R): The nuclear spin magnetic moment is much more than electron spin magnetic moment.
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 Discuss
Correct Answer: A is true but R is false
Explanation:
Nuclear spin is of the same order as electron sum.- 10. In solid insulator materials having only one kind of atom, the types of polarization which exist are
Options- A. electronic only
- B. electronic and ionic
- C. electronic, ionic and permanent
- D. electronic and permanent Discuss
Correct Answer: electronic only
Explanation:
In elemental dielectrics only electronic polarization exists.
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