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Test: Electrostatics of Dielectrics - NEET MCQ


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10 Questions MCQ Test Physics Class 12 - Test: Electrostatics of Dielectrics

Test: Electrostatics of Dielectrics for NEET 2024 is part of Physics Class 12 preparation. The Test: Electrostatics of Dielectrics questions and answers have been prepared according to the NEET exam syllabus.The Test: Electrostatics of Dielectrics MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electrostatics of Dielectrics below.
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Test: Electrostatics of Dielectrics - Question 1

1 microfarad is equal to​:

Detailed Solution for Test: Electrostatics of Dielectrics - Question 1

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

Test: Electrostatics of Dielectrics - Question 2

The polarized dielectric is equivalent to ________

Detailed Solution for Test: Electrostatics of Dielectrics - Question 2

A polarized dielectric is equivalent to two charged surfaces with induced charges (polarization charges). 

Test: Electrostatics of Dielectrics - Question 3

The dielectric constant of a metal is:

Detailed Solution for Test: Electrostatics of Dielectrics - Question 3

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.
Test: Electrostatics of Dielectrics - Question 4

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

Detailed Solution for Test: Electrostatics of Dielectrics - Question 4
  • 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.
Test: Electrostatics of Dielectrics - Question 5

The extent of polarization depends on

Detailed Solution for Test: Electrostatics of Dielectrics - Question 5

 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.

Test: Electrostatics of Dielectrics - Question 6

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

Detailed Solution for Test: Electrostatics of Dielectrics - Question 6

As charges are separated on the surface of the dielectric but not in its interior volume.

Test: Electrostatics of Dielectrics - Question 7

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

Detailed Solution for Test: Electrostatics of Dielectrics - Question 7
  • 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. 
Test: Electrostatics of Dielectrics - Question 8

The dipole moment per unit volume is called:

Detailed Solution for Test: Electrostatics of Dielectrics - Question 8

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.

Test: Electrostatics of Dielectrics - Question 9

The displacement of charges inside the dielectric stops when

Detailed Solution for Test: Electrostatics of Dielectrics - Question 9

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.

Test: Electrostatics of Dielectrics - Question 10

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

Detailed Solution for Test: Electrostatics of Dielectrics - Question 10

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

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