Explore topic-wise MCQs in Electromagnetic Theory.

This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Electromagnetic Theory knowledge and support exam preparation. Choose a topic below to get started.

1.

Faraday’s law of electromagnetic induction is mathematically described by which one of the following equations?

A. \(\vec \nabla \cdot {\rm{\vec B}} = 0\)
B. \(\vec \nabla \cdot {\rm{\vec D}} = {\rm{\rho v}}\)
C. \(\vec \nabla \times {\rm{\vec E}} = - \frac{{\partial {\rm{\vec B}}}}{{\partial {\rm{t}}}}\)
D. \(\vec \nabla \times {\rm{\vec H}} = {\rm{\sigma \vec E}} + \frac{{\partial {\rm{\vec D}}}}{{\partial {\rm{t}}}}\)
Answer» D. \(\vec \nabla \times {\rm{\vec H}} = {\rm{\sigma \vec E}} + \frac{{\partial {\rm{\vec D}}}}{{\partial {\rm{t}}}}\)
Discussion
2.

Maxwell’s electromagnetic equations are valid under all conditions except one that is

A. they do not apply to non-isotropic media
B. they do not apply to non-homogeneous media
C. they do not apply to media which move with respect to system coordinates
D. they do not apply to non-linear-media
Answer» B. they do not apply to non-homogeneous media
Discussion
3.

According to Faraday's law, the voltage v induced in the coil with N turns and magnetic flux ϕ is:

A. \(v=\dfrac{1}{N}\dfrac{d{\phi}}{dt}\)
B. \(v= {N^2}\frac{d{\phi}}{dt}\)
C. \(v=N\dfrac{d{\phi}}{dt}\)
D. \(v=N\dfrac{d{^2\phi}}{dt^2}\)
Answer» D. \(v=N\dfrac{d{^2\phi}}{dt^2}\)
Discussion
4.

A quantitative relation between induced emf and rate of change of flux linkage is known as

A. Maxwell's law
B. Stoke's law
C. Lenz's law
D. Faraday's law
Answer» E.
Discussion
5.

If conductor is moved in a stationary magnetic field, then emf induced in it. Such an emf is known as:

A. Self-induced emf
B. Back emf
C. Static-induced emf
D. Dynamically-induced emf
Answer» E.
Discussion
6.

All induction type transducers are based on

A. Faraday's law
B. Ohm's law
C. Seebeck effect
D. Peltier effect
Answer» B. Ohm's law
Discussion
7.

If the conductor is stationary and the field is changing (varying), then emf induced in it. Such an emf is known as:

A. Self-induced emf
B. Back emf
C. Static-induced emf
D. Dynamically-induced emf
Answer» D. Dynamically-induced emf
Discussion
8.

If the magnetic flux through each turn of the coil consisting of 200 turns is (t2 - 3t) milli-Webers, where t is in seconds, then the induced emf in the coil at t = 4 sec is

A. -1 V
B. 1 V
C. -0.1 V
D. 0.1 V
Answer» B. 1 V
Discussion
9.

A conductor of length 100 cm, moves at right angle to a uniform field flux density of 1.5 Wb/m2 with a velocity of 50 m/s. The emf induced in the conductor will be:

A. 150 V
B. 75 V
C. 50 V
D. 37.5 V
Answer» C. 50 V
Discussion
10.

Maxwell's equations are obeyed by the E.M. waves when these waves are travelling:

A. Only in free space
B. Only in free space and water and but not in a plasma medium
C. Only in free space, water and gases but not in solids
D. In all solids, liquids, gases and any other medium given above
Answer» E.
Discussion
11.

Choose the expression for Faraday's second Law of Electromagnetic Induction.Note: ϵ is the electromotive force, ϕ is the magnetic flux, N is the number of turns

A. \(\epsilon \ = -Nd \ \phi /dt\)
B. \(\epsilon = Nd \ \phi /dt\)
C. \(\epsilon = N2d \ \phi /dt\)
D. \(\epsilon = -N(d \ \phi /dt)2\)
Answer» B. \(\epsilon = Nd \ \phi /dt\)
Discussion
12.

For a tightly wound coil of wire, composed of N identical turns, each with the same ΦB, ________ of induction states that \(\varepsilon=-\dfrac{d\Phi_B}{dt}\) where N is the number of turns of wire and ΦB is the magnetic flux through a single loop.

A. Faraday’s law
B. Norton’s law
C. Kirchoff’s law
D. Thevenin’s law
Answer» B. Norton’s law
Discussion
13.

Magnetic current is composed of which of the following?

A. Only conduction component
B. Only displacement component
C. Both conduction and displacement component
D. Neither conduction nor displacement component
Answer» D. Neither conduction nor displacement component
Discussion
14.

In the table shown, List I and List II, respectively, contain terms appearing on the left-hand side and the right-hand side of Maxwell’s equations (in their standard form). Match the left-hand side with the corresponding right-hand side.List IList II1.∇. DP02.∇ × EQ\(\rho_v\)3.∇. BR\( \frac{{ - dB}}{{dt}}\)4.∇ × HS\(J + \frac{{dD}}{{dt}}\)

A. 1 - P, 2 - R, 3 - Q, 4 - S
B. 1 - Q, 2 - R, 3 - P, 4 - S
C. 1 - Q, 2 - S, 3 - P, 4 - R
D. 1 - R, 2 - Q, 3 - S, 4 - P
Answer» C. 1 - Q, 2 - S, 3 - P, 4 - R
Discussion