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Test: Magnetic Boundary Conditions


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10 Questions MCQ Test Electromagnetic Fields Theory (EMFT) | Test: Magnetic Boundary Conditions

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

Find the correct relation between current density and magnetization.

Detailed Solution for Test: Magnetic Boundary Conditions - Question 1

Answer: c
Explanation: The curl of the magnetization gives the magnetic field intensity theoretically. From Maxwell equation, we can correlate that with the current density (Ampere law)

Test: Magnetic Boundary Conditions - Question 2

The tangential component of the magnetic field intensity is continuous at the boundary of separation of two media. State True/False. 

Detailed Solution for Test: Magnetic Boundary Conditions - Question 2

Answer: a
Explanation: For two medium of separation, the tangential component of the magnetic field intensity will be continuous. This is analogous to the fact that the tangential component of the electric field intensity is continuous at the boundary.

Test: Magnetic Boundary Conditions - Question 3

In air, the tangential component of flux density is continuous at the boundary. State True/False.

Detailed Solution for Test: Magnetic Boundary Conditions - Question 3

Answer: a
Explanation: Since the tangential component of the magnetic field intensity will be continuous and B = μH, in air, the tangential component of the flux density will also be continuous.

Test: Magnetic Boundary Conditions - Question 4

The flux density of medium 1 has a normal component of 2.4 units, then the normal component of the flux density in the medium 2 will be

Detailed Solution for Test: Magnetic Boundary Conditions - Question 4

Answer: c
Explanation: Unlike the electric fields, the magnetic flux density has normal component same in both the mediums. This gives Bn1 = Bn2.

Test: Magnetic Boundary Conditions - Question 5

The normal component of magnetic field intensity at the boundary of separation of the medium will be

Detailed Solution for Test: Magnetic Boundary Conditions - Question 5

Answer: a
Explanation: The normal component and tangential components of the magnetic flux density will be same. This holds good for any medium.

Test: Magnetic Boundary Conditions - Question 6

The line integral of the magnetic field intensity is the

Detailed Solution for Test: Magnetic Boundary Conditions - Question 6

Answer: b
Explanation: The line integral of the magnetic field intensity is given by ∫H.dl. This is same as the current component. From this relation, the Ampere law can be deduced.

Test: Magnetic Boundary Conditions - Question 7

Find the magnetization of the material with susceptibility of 6 units and magnetic field intensity of 13 units.

Detailed Solution for Test: Magnetic Boundary Conditions - Question 7

Answer: c
Explanation: The magnetization is the product of the susceptibility and the magnetic field intensity. Thus M = 6 x 13 = 78 units.

Test: Magnetic Boundary Conditions - Question 8

Find the ratio of permeability of the two media when the wave is incident on the boundary at 45 degree and reflected by the boundary at 60 degree.

Detailed Solution for Test: Magnetic Boundary Conditions - Question 8

Answer: c
Explanation: From the magnetic boundary conditions, the ratio of permeability μ1/μ2 = tan θ1/tan θ2 and θ1 = 45, θ2 = 60. Thus we get μ1/μ2 = 1/√3. The ratio will be 1:√3.

Test: Magnetic Boundary Conditions - Question 9

Find the magnetic moment of a material with magnetization 5 units in a volume of 35 units.

Detailed Solution for Test: Magnetic Boundary Conditions - Question 9

Answer: d
Explanation: The magnetization is the ratio of the magnetic moment and the volume. To get moment, put M = 5 and V = 35, thus moment will be 5 x 35 = 175 units.

Test: Magnetic Boundary Conditions - Question 10

A boundary of separation between two magnetic materials is identified by which factor?

Detailed Solution for Test: Magnetic Boundary Conditions - Question 10

Answer: a
Explanation: Two materials are differentiated by their permeability in case of magnetic and permittivity in case of electric. Thus at the boundary of separation, change in permeability is identified for magnetic materials.

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