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