# Electromagnetic Fields : 100 Most Important Questions with Solutions

By Vishnu Pratap Singh|Updated : October 18th, 2021

#### You have just completed the syllabus of the Electromagnetic Fields subject for the Electrical Engineering Branch. Here you will find all the 100 Most Important Questions with Solutions Of  Electromagnetic Fields questions of the first chapter have displayed for you illustration :

You have just completed the syllabus of the Electromagnetic Fields subject for the Electrical Engineering Branch. Here you will find all the 100 Most Important Questions with Solutions Of  Electromagnetic Fields questions of the first chapter have displayed for you illustration :

1.Which of the following is Poisson’s equation?

A. B. C. D. Solution |||    2.If . Then the value of is ________.

A. x2z
B. 2xyz
C. 0
D. None of the above

Solution ||| = 3x2y –2x2y –x2y

= 0

3.Equation is based on

A. Gauss's law
B. Lenz's Law
C. Ampere's Law
D. Continuity Equation

Solution ||| Magnetic monopoles are not physically possible as per Gauss's Law i.e. 4.The space between the plates of a parallel plate capacitor of capacitance C is filled with three dielectric slabs of identical size as shown in the below figure. If dielectric constants are the new capacitance is A. B. C. D. Solution ||| The circuit shown is connected in parallel with different permittivities of dielectric slabs.
So. Since all the three slabs are connected in parallel so net capacitance is 5.Electric displacement current density D at any point on a spherical surface of radius r centered at the isolated charge q is

A. B. C. D. Solution ||| Electric field intensity 6.What is the force developed pet meter length between two current-carrying conductors 10cm apart and carrying 1000A and 1500 A currents, respectively?

A. 3 N
B. C. 2 N
D. Solution ||| 7.Tho potential ( scalar ) distribution is given as V=10y4 + 20x3 . If is the permittivity of free space what is the charge density at the point (2, 0) ?

A. -200 B. -200/ C. 200 D. -240 Solution ||| Poisson’s equation is   At point (2,0)  8.Equipotential surface about a point charge is in which one of the following forms?

A. Spheres
B. Planes
C. Cylinders
D. Cubes

Solution ||| Equipotential surface about a potential charge is a sphere 9.Which one of the following statements is correct?

A. Both Laplace's and Poisson's equations are non-linear equation differential equation
B. Laplace’s equation is non-linear but Poisson’s equation is a linear differential equation
C. Laplace’s equation is linear but Poisson’s equation is a non-linear differential equation
D. Both Laplace’s and Poisson’s equation are linear differential equation

Solution ||| The above equation is known as Poisson's  Equation which states that the Potential distribution in a region depends upon the local charge distribution.

In some cases the charge distribution is involved on the surface of the conductor for which the free charge volume density is zero, i.e; ρ = 0., in that case, the Poisson equation reduces to

2 V = 0 ⇒ This equation is known as the Laplacian equation.

& the above equation Poisson & Laplacian Equation both are Linear Differential Equation.

10.A time-varying magnetic flux linked to a 100-turn coil is given by Ф = 5t3 – 2t. The emf induced at t = 5 seconds is

A. –373 V
B. 37.3 KV
C. -37.3 KV
D. None of the above

Solution ||| At t = 5 sec, e = –373 V

emf induced in 100-turns = 373 × 100

= –37.3 kV

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