When an electric field E is applied to solid and liquid insulating materials, th

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Question
When an electric field E is applied to solid and liquid insulating materials, the internal field E_i acting at the location of atom is such that
Options
A. E_i = E
B. E_i > E
C. E_i < E
D. E_i may be equal to or less than E

Correct Answer

E_i > E

Explanation

The actual field seen by an atom is larger than applied field.

Materials and Components problems

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1. Assertion (A): Power loss in a conductor of resistance P = I²R.
Reason (R): When a conductor is carrying current with current density J as a result of applied field E, then heat developed/m³/ second = JE.
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

2. Which of the following are donor impurities?
1. Gold
2. Phosphorus
3. Boron
4. Antimony
5. Arsenic
6. Induim
Select the correct answer using the following codes
Options
A. 1, 2, 3
B. 1, 2, 4, 6
C. 3, 4, 5, 6
D. 2, 4, 5

3. Assertion (A): Atomic number of sodium is 11.
Reason (R): Sodium has a body centred cubic lattice.
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

4. At room temperature, the current in intrinsic semiconductor is due to
Options
A. holes
B. electrons
C. ions
D. holes and electrons

5. Ferroelectric materials are those which
Options
A. cannot be polarized
B. have a permanent polarization
C. have a_e equal to zero
D. have ?_p = 0

6. The number of valence electrons in donor impurity are
Options
A. 5
B. 4
C. 3
D. 1

7. Assertion (A): In imperfect capacitors, the current does not lead the applied ac voltage by 90�.
Reason (R): When subjected to ac fields, the dielectric constant can be expressed as ?^'_r - j?^"_r.
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

8. Assertion (A): Ferroelectric materials have spontaneous polarization.
Reason (R): Above curie temperature, ? = for ferro-electric materials.
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

9. Which capacitor-store higher amount of energy?
Options
A. Air capacitor
B. Paper capacitor
C. Mica capacitor
D. Plastic film capacitor

10. If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then
Options
A. the majority carrier density is doubled
B. the minority carrier density is doubled
C. the minority carrier density becomes 4 times the original value
D. both the majority and minority carrier densities double

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