On This Page

This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 7

Q1 | Which of the following is not an example of elemental solid dielectric?
  • diamond
  • sulphur
  • silicon
  • germanium
Q2 | Compute the refractive index when the dielectric constant is 256 in air.
  • 2562
  • 16 c) 256
  • d) 64
Q3 | Curie-Weiss law is applicable to which of the following materials?
  • piezoelectric
  • ferroelectric
  • pyroelectric
  • anti-ferroelectric
Q4 | Curie-Weiss law is used to calculate which one of the following?
  • permittivity
  • permeability
  • electric susceptibility
  • magnetic susceptibility
Q5 | Calculate the loss tangent when the dielectric constant in AC field is given by 3 + 2j.
  • (2/3)
  • (3/2)
  • (-3/2)
  • (-2/3)
Q6 | When a dielectric loses its dielectric property, the phenomenon is called
  • dielectric loss
  • dielectric breakdown
  • polarisation
  • magnetization
Q7 | Choose the best definition of dielectric loss.
  • absorption of electric energy by dielectric in an ac field
  • dissipation of electric energy by dielectric in a static field
  • dissipation of heat by dielectric
  • product of loss tangent and relative permittivity
Q8 | For a conservative field which of the following equations holds good?
  • ∫ e.dl = 0
  • ∫ h.dl = 0
  • ∫ b.dl = 0
  • ∫ d.dl = 0
Q9 | Find the electric field if the surface density at the boundary of air is 10-9.
  • 12π
  • 24π
  • 36π
  • 48π
Q10 | Find the flux density at the boundary when the charge density is given by 24 units.
  • 12
  • 24
  • 48
  • 96
Q11 | The normal component of which quantity is always discontinuous at the boundary?
  • e
  • d
  • h
  • b
Q12 | Find the permittivity of the surface when a wave incident at an angle 60 is reflected by the surface at 45 in air.
  • 1.41
  • 3.5
  • 2.2
  • 1.73
Q13 | In free space, the Poisson equation becomes
  • maxwell equation
  • ampere equation
  • laplace equation
  • steady state equation
Q14 | If Laplace equation satisfies, then which of the following statements will be true?
  • potential will be zero
  • current will be infinite
  • resistance will be infinite
  • voltage will be same
Q15 | Suppose the potential function is a step function. The equation that gets satisfied is
  • laplace equation
  • poisson equation
  • maxwell equation
  • ampere equation
Q16 | The function V = exsin y + z does not satisfy Laplace equation. State True/False.
  • true
  • false
Q17 | Poisson equation can be derived from which of the following equations?
  • point form of gauss law
  • integral form of gauss law
  • point form of ampere law
  • integral form of ampere law
Q18 | Find the charge density from the function of flux density given by 12x – 7z.
  • 19
  • -5
  • 5
  • -19
Q19 | Find the electric field of a potential function given by 20 log x + y at the point (1,1,0).
  • -20 i – j
  • -i -20 j
  • i + j
  • (i + j)/20
Q20 | When a material has zero permittivity, the maximum potential that it can possess is
  • -∞
  • unity
  • zero
Q21 | Work done in charging a capacitor is
  • qv
  • 1⁄2qv
  • 2qv
  • qv2
Q22 | Energy stored in 2000mF capacitor charged to a potential difference of 10V is?
  • 100j
  • 200j
  • 300j
  • 400j
Q23 | When do we get maximum energy from a set of capacitors?
  • when they are connected in parallel
  • when they are connected in series
  • both in series and parallel
  • insufficient information provided
Q24 | Calculate the energy in the 2F capacitor.
  • 8.6kj
  • 64kj
  • 64j
  • 6.4kj