Electrostatics Test

Result

Electrostatics Test - 11

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

1 microfarad is equal to:

A
10^-6F

B
10^-12F

C
10^-15F

D
10^-9F

Solution

The microfarad (symbolized µF) is a unit of capacitance, equivalent to 0.000001 (10 to the -6th power) farad.
Question 2
1 / -0

The polarized dielectric is equivalent to ________

A
non-zero volume charge density.

B
one charged surface with induced surface charge density.

C
two charged surfaces with induced surface charge densities.

D
zero surface charge density.

Solution

A polarized dielectric is equivalent to two charged surfaces with induced charges (polarization charges).
Question 3
1 / -0

The dielectric constant of a metal is:

A
infinite

B
zero

C
equal to one

D
less than one
Solution
The dielectric constant of metal is infinite as the net electric field inside the metal is zero.
The dielectric constant is defined as the ratio of the permittivity of a substance to the permittivity of free space.
As the electric flux density increases, the dielectric constant increases.
Question 4
1 / -0

Which of the following statements is not true for polar molecules?

A
permanent dipole moment

B
examples are oxygen and hydrogen molecules

C
the centres of positive and negative charges are separated

D
examples are HCl or water molecules
Solution
Polar molecules occur when two atoms do not share electrons equally in a covalent bond.
The oxygen side of the molecule has a slight negative charge, while the side with the hydrogen atoms has a slight positive charge.
Ethanol is polar because the oxygen atoms attract electrons because of their higher electronegativity than other atoms in the molecule.
Question 5
1 / -0

The extent of polarization depends on

A
Kinetic energy of bound charges

B
Dipole potential energy

C
Dipole potential energy and thermal energy

D
Thermal energy

Solution

The extent of polarization of dielectrics depends on the relative strength of two mutually opposite factors - the dipole potential energy tending to align the dipole with the external field and thermal energy tending to disrupt the alignment.
Question 6
1 / -0

A uniformly polarized dielectric amounts to induced ______ charge density but no ______charge density.

A
volume, surface

B
surface, volume

C
volume, line

D
line, volume

Solution

As charges are separated on the surface of the dielectric but not in its interior volume.
Question 7
1 / -0

When a conductor is placed in an electric field; its free charge carriers adjust itself in order to oppose the electric field. This happen until

A
Both the fields cancel out each other

B
Induced field become more than external field

C
External field reach the maximum value

D
Induced field reach the maximum value
Solution
When an external electric field is applied to the conductor, the free electrons in the conductor move in an opposite direction to that of the applied electric field.
This movement of electrons induces another electric field inside the conductor which opposes the original external electric field.
This continues until the induced electric field cancels out the external field.
Question 8
1 / -0

The dipole moment per unit volume is called:

A
Polarization

B
Surface charge density

C
Linear charge density

D
Volume charge density

Solution

The electric dipole moment per unit volume is called polarization or polarization density (vector p). It is always directed from negative charge to positive charge.
Question 9
1 / -0

The displacement of charges inside the dielectric stops when

A
the external field becomes maximum

B
the external force on the charges of the molecules is balanced by the force due to internal fields

C
the internal force on the charges of the molecules is balanced by the forces due to the internal fields

D
none of the above

Solution

The displacement of charges inside the dielectric stops when the external force on the charges of the molecules is balanced by the force due to internal fields.
Question 10
1 / -0

The electric field inside a dielectric decreases, when it is placed in an external electric field. This happens due to ________

A
Electrostatic shielding.

B
Polarization.

C
Electrostatic repulsion between atoms.

D
Electrostatic attraction between atoms.

Solution

The external electric field polarizes the dielectric and an electric field is produced.
The net electric field inside the dielectric decreases due to polarization.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Electrostatics Test - 11

Result

Electrostatics Test - 11

Score

-

Rank

-

SHARING IS CARING

Question 1

10-6 F

10-12 F

10-15 F

10-9 F

Solution

Question 2

non-zero volume charge density.

one charged surface with induced surface charge density.

two charged surfaces with induced surface charge densities.

zero surface charge density.

Solution

Question 3

infinite

zero

equal to one

less than one

Solution

Question 4

permanent dipole moment

examples are oxygen and hydrogen molecules

the centres of positive and negative charges are separated

examples are HCl or water molecules

Solution

Question 5

Kinetic energy of bound charges

Dipole potential energy

Dipole potential energy and thermal energy

Thermal energy

Solution

Question 6

volume, surface

surface, volume

volume, line

line, volume

Solution

Question 7

Both the fields cancel out each other

Induced field become more than external field

External field reach the maximum value

Induced field reach the maximum value

Solution

Question 8

Polarization

Surface charge density

Linear charge density

Volume charge density

Solution

Question 9

the external field becomes maximum

the external force on the charges of the molecules is balanced by the force due to internal fields

the internal force on the charges of the molecules is balanced by the forces due to the internal fields

none of the above

Solution

Question 10

Electrostatic shielding.

Polarization.

Electrostatic repulsion between atoms.

Electrostatic attraction between atoms.

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

10^-6F

10^-12F

10^-15F

10^-9F