Electromagnetics Field (3140912) MCQs

MCQs of Conductors, Dielectrics and Capacitance

Showing 1 to 10 out of 11 Questions
1.
From following what is true about convection current. (i) involves conductors (ii) does not satisfies ohm's law (iii) flow of electron in vaccum tube from cathode to anode is its example.
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) none of the above
Answer:

Option (c)

2.
If the characteristics of the material are independent of the direction of the vector fields, the material is __________
(a) Isotropic
(b) Linear
(c) Homogeneous
(d) All the three
Answer:

Option (a)

3.
If the parameters of the material do not depend no the magnitude of the field quantities then the material is __________ .
(a) Isotropic
(b) Linear
(c) Homogeneous
(d) All of the above
Answer:

Option (b)

4.
Following are properties of a perfect conductor except ___________.
(a) Electric field intensity within the conductor is zero.
(b) Surface of a conductor is an equipotential surface.
(c) Charge density within conductor is non-zero.
(d) Tangential component of external electrical field intensity as well as electric flux density is zero
Answer:

Option (c)

5.
For a metallic conductor, the current density is proportional to electric field intensity where the proportionality constant is conductivity, This is expressed by ________,
(a) Gauss law in point form
(b) Ohm's law in point form
(c) Ampere's law
(d) Faraday's law
Answer:

Option (b)

6.
The continuity equation is a combination of which of the two laws?
(a) Ohm’s law and Gauss law
(b) Ampere law and Gauss law
(c) Ohm’s law and Ampere law
(d) Maxwell law and Ampere law
Answer:

Option (a)

7.
Find the current at time t = 2 seconds if the charge is given as function of time q(t) = 3t + t2
(a) 3
(b) 5
(c) 7
(d) 9
Answer:

Option (c)

8.
The charge within a conductor will be
(a) 1
(b) -1
(c) 0
(d) infinity
Answer:

Option (c)

9.
Which component of the electric field intensity is always continuous at the boundary of the dielectric-dielectric
(a) Horizontal
(b) Vertical
(c) Normal
(d) Tangential
Answer:

Option (d)

10.
Find the electric field if the surface density at the boundary of air is 10-9
(a) 12π
(b) 24π
(c) 36π
(d) 48π
Answer:

Option (c)

Showing 1 to 10 out of 11 Questions