Courses

# Test: Magnetic Materials

## 10 Questions MCQ Test Electromagnetic Theory | Test: Magnetic Materials

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

### The presence of parallel alignment of magnetic dipole moment is given by which materials?

Solution:

Explanation: The ferromagnetic materials are characterized by parallel alignment of magnetic dipole moments. Their susceptibility is very large.

QUESTION: 2

### The magnetic materials follow which law?

Solution:

Explanation: Generally, the ferromagnetic, paramagnetic and diamagnetic materials follow the Curie Weiss law, which relates the magnetization and the applied field.

QUESTION: 3

### Find the internal field when the applied field is 12 units, molecular field constant is 0.1 units and the magnetization is 74 units.

Solution:

Explanation: From Curie law, the internal field of a magnetic material is given by H = Ho + χ M, where χ is the molecular field constant. Put χ = 0.1, M = 74 and Ho = 12, we get H = 12 + (0.1)74 = 19.4 units.

QUESTION: 4

In which materials the magnetic anisotropy is followed?

Solution:

Explanation: In materials like iron, the magnetic properties depend on the direction in which they are measured. This is magnetic anisotropy. The material iron is a ferromagnetic material type.

QUESTION: 5

Piezoelectric effect is analogous to which phenomenon?

Solution:

Explanation: The piezoelectric effect is the mechanical strain caused on a material like quartz when subjected to an electric field. The same is observed in a ferromagnetic material called magnetostriction.

QUESTION: 6

The converse of magnetostriction is called the

Solution:

Explanation: When a strain is applied, the change in magnetic field is observed. This is the converse of the magnetostriction phenomenon and is called Villari effect.

QUESTION: 7

The materials having very small susceptibility at all temperatures are

Solution:

Explanation: In antiferromagnetic materials, the susceptibility will decrease with increase in temperature. They have relatively small susceptibility at all temperatures.

QUESTION: 8

Find the susceptibility when the curie constant is 0.2 and the difference in critical temperature and paramagnetic curie temperature is 0.01.

Solution:

Explanation: The susceptibility in magnetic materials is given by χm = C/(T-θ), where C is the curie constant, T is the critical temperature and θ is the paramagnetic curie temperature. Put C = 0.2 and T-θ = 0.01, thus we get susceptibility as 0.2/0.01 = 20.

QUESTION: 9

The susceptibility is independent of temperature in which material?

Solution: