Polarisation Of Dielectrics MCQ Level - 1

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This mock test of Polarisation Of Dielectrics MCQ Level - 1 for Physics helps you for every Physics entrance exam. This contains 10 Multiple Choice Questions for Physics Polarisation Of Dielectrics MCQ Level - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Polarisation Of Dielectrics MCQ Level - 1 quiz give you a good mix of easy questions and tough questions. Physics students definitely take this Polarisation Of Dielectrics MCQ Level - 1 exercise for a better result in the exam. You can find other Polarisation Of Dielectrics MCQ Level - 1 extra questions, long questions & short questions for Physics on EduRev as well by searching above.

QUESTION: 1

Polarization per unit applied electric field is given by

A.
electric susceptibility
B.
electric polarization
C.
dielectric constant
D.
magnetic susceptibility

Solution:

The correct answer is: electric susceptibility

QUESTION: 2

Two parallel plates have equal and opposite charges. When the space between them is evacuated the electric intensity is 3 × 10⁵V/m and when the space is filled with dielectric the electric intensity is 1.0 × 10⁵V/m. The induced charge density on the surface of the dielectric.

Solution:

Electrified in vacuum

Surface density of induced charges,

The correct answer is:

QUESTION: 3

Polarization in a dielectric on application of electric field is

A.
Displacement / separation of opposite charge centers
B.
Passing of current through dielectric
C.
Excitation of electron to higher energy level
D.
All of the above

Solution:

The correct answer is: Displacement / separation of opposite charge centers

QUESTION: 4

The outer sphere of spherical capacitor is earthed. For increasing its capacitance.

A.
the earthing of the outer sphere is removed
B.
vacuum is created between two spheres
C.
the space between two spheres is increased
D.
dielectric material is filled between the two spheres

Solution:

The correct answer is: dielectric material is filled between the two spheres

QUESTION: 5

The relation between bound charge density ρ_b to free charge (extraneous charge) ρ_f is given by

Solution:

The correct answer is:

QUESTION: 6

If is the polarization vector and is the unit vector normal to the surface then a polarized piece of a dielectric can be regarded as equivalent to

A.
only charges of a surface density
B.
only charges of volume density
C.
charges of a volume density and surface charges of density ρ_b is given by
D.
charges of volume density and surface

Solution:

The correct answer is: charges of a volume density and surface charges of density ρ_b is given by

QUESTION: 7

The susceptibility of a polar dielectric is temperature dependent because

A.
They are necessarily anisotropic in a nature
B.
Their polarization is mainly caused by the torque due to the external field tending to align their ‘permanent’ dipoles in a direction parallel to the field
C.
Their polarization is mainly caused by the relative separation of the positive charges within the individual molecule by external field
D.
All of the above

Solution:

The correct answer is: They are necessarily anisotropic in a nature

QUESTION: 8

At the boundary or interface between two dielectric media the vector and are such that

A.
The normal component of and normal component of are always the same on each side of the boundary
B.
The tangential component of and the normal component of is same on each side of the boundary. The latter condition is however, valid only in the absence of any free charges on the interface
C.
Tangential component of and normal component of are always the same on each side of the boundary
D.
None of these

Solution:

The correct answer is: The tangential component of and the normal component of is same on each side of the boundary. The latter condition is however, valid only in the absence of any free charges on the interface

QUESTION: 9

In a dielectric conductor boundary (interface). The tangential component of electric field is

A.
E_T
B.
∞
C.
0
D.
2E_T

Solution:

The correct answer is: 0

QUESTION: 10

The behavior of a dielectric is

A.
similar in an electrostatic field and in a varying electric field.
B.
different for static and varying field but is independent of the frequency
C.
different for static and varying field and is very much depend on the frequency
D.
None of the above