Test: Polarization

# Test: Polarization

Test Description

## 10 Questions MCQ Test Electromagnetic Fields Theory (EMFT) | Test: Polarization

Test: Polarization for Electrical Engineering (EE) 2023 is part of Electromagnetic Fields Theory (EMFT) preparation. The Test: Polarization questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Polarization MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Polarization below.
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Test: Polarization - Question 1

### The best definition of polarisation is

Detailed Solution for Test: Polarization - Question 1

Explanation: The polarisation is defined mathematically as the electric dipole moment per unit volume. It is also referred to as the orientation of the dipoles in the direction of applied electric field.

Test: Polarization - Question 2

### Calculate the polarisation vector of the material which has 100 dipoles per unit volume in a volume of 2 units.

Detailed Solution for Test: Polarization - Question 2

Explanation: Polarisation vector P = N x p, where N = 100 and p = 2. On substituting we get P = 200 units.

Test: Polarization - Question 3

### Polarizability is defined as the

Detailed Solution for Test: Polarization - Question 3

Explanation: Polarizability is a constant that is defined as the ratio of elemental dipole moment to the electric field strength.

Test: Polarization - Question 4

Calculate the energy stored per unit volume in a dielectric medium due to polarisation when P = 9 units and E = 8 units.

Detailed Solution for Test: Polarization - Question 4

Explanation: The energy stored per unit volume in a dielectric medium is given by, W = 0.5 X PE = 0.5 X 9 X 8 = 36 units.

Test: Polarization - Question 5

Identify which type of polarisation depends on temperature.

Detailed Solution for Test: Polarization - Question 5

Explanation: The electronic, ionic and interfacial polarisation depends on the atoms which are independent with respect to temperature. Only the orientational polarisation is dependent on the temperature and is inversely proportional to it.

Test: Polarization - Question 6

Calculate the polarisation vector in air when the susceptibility is 5 and electric field is 12 units.

Detailed Solution for Test: Polarization - Question 6

Explanation: The polarisation vector is given by, P = ε0 x χe x E, where χe = 5 and ε0 = 12. On substituting, we get P = 1 x 5 x 12 = 60 units.

Test: Polarization - Question 7

In isotropic materials, which of the following quantities will be independent of the direction?

Detailed Solution for Test: Polarization - Question 7

Explanation: Isotropic materials are those with radiate or absorb energy uniformly in all directions (eg. Isotropic antenna). Thus it is independent of the direction.

Test: Polarization - Question 8

The total polarisation of a material is the

Detailed Solution for Test: Polarization - Question 8

Explanation: The total polarisation of a material is given by the sum of electronic, ionic, orientational and interfacial polarisation of the material.

Test: Polarization - Question 9

In the given types of polarisation, which type exists in the semiconductor?

Detailed Solution for Test: Polarization - Question 9

Explanation: The interfacial type of polarisation occurs due to accumulation of charges at the interface in a multiphase material. This interface or junction is found in a semiconductor material.

Test: Polarization - Question 10

Solids do not have which type of polarisation?

Detailed Solution for Test: Polarization - Question 10

Explanation: Solids possess permanent dipole moments. Moreover they do not have junction like semiconductors. Thus, solids neglect the interfacial and space charge polarisation. They possess only electronic, ionic and orientational polarisations.

## Electromagnetic Fields Theory (EMFT)

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