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This mock test of Test: Magnetostatic Properties for Electronics and Communication Engineering (ECE) helps you for every Electronics and Communication Engineering (ECE) entrance exam.
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QUESTION: 1

The magnetostatics highly relies on which property?

Solution:

Answer: c

Explanation: The magnetostatics highly relies on the inductance of the magnetic materials, which decides its behavior in the influence of magnetic field.

QUESTION: 2

The inductance is the measure of

Solution:

Answer: b

Explanation: The inductance is a property of an electric conductor/coil which measures the amount of emf generated by passing current through the coil.

QUESTION: 3

Find the total flux in a coil of magnetic flux density 12 units and area 7 units.

Solution:

Answer: a

Explanation: The total flux in a coil is defined by φ = BA, where B = 12 and A = 0.07. On substituting these values, we get φ = 12 x 0.07 = 0.84 units.

QUESTION: 4

Find the energy of a coil of inductance 18mH and current passing through it 1.25A.(in 10^{-3}order)

Solution:

Answer: a

Explanation: The magnetic energy possessed by a coil is given by E = 0.5 x LI^{2}. Put L = 18 x 10^{-3} and I = 1.25, thus we get E = 0.5 x 18 x 10^{-3} x 1.25^{2} = 14.06 x 10^{-3} units.

QUESTION: 5

Using Maxwell equation which of the following cannot be calculated directly?

Solution:

Answer: c

Explanation: The Maxwell equations can be used to compute E,H,D,B and J directly. It is not possible to find the magnetic vector potential A directly.

QUESTION: 6

Which of the following relation will hold good?

Solution:

Answer: d

Explanation: The magnetic flux density is the product the permeability and the magnetic field intensity. This statement is always true for any material (permeability).

QUESTION: 7

The permeability and permittivity of air or free space is unity. State true/false.

Solution:

Answer: b

Explanation: The permeability and permittivity of free space or air is always unity. This implies that the air is always ready to store electric or magnetic charges subjected to it.

QUESTION: 8

Choose the best relation.

Solution:

Answer: c

Explanation: For any magnetic field, the magnetic field intensity will be the negative gradient of the potential of the field. This is given by H = -Grad(V).

QUESTION: 9

Find the magnetic field when the magnetic vector potential is a unit vector.

Solution:

Answer: c

Explanation: We know that H = -Grad(V), where is a unit vector. The gradient of a constant/unit vector will be zero. Thus the magnetic field intensity will be zero.

QUESTION: 10

Find the force experienced by an electromagnetic wave in a conductor?

Solution:

Answer: d

Explanation: The electromagnetic wave experiences Lorentz force which is the combination of the electrostatic force and magneto static force. It is given by F = QE + Q(V X B).

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