A boundary of separation between two magnetic materials is identified by which
factor?
a) Change in the permeability
b) Change in permittivity
c) Change in magnetization
d) Conduction

1 Answer

Answer :

a) Change in the permeability

Related questions

Description : The reason for non existence of magnetic monopoles is a) The magnetic field cannot be split b) Due to permeability c) Due to magnetization d) Due to magnetostriction

Last Answer : a) The magnetic field cannot be split

Description : In isotropic materials, which of the following quantities will be independent of the direction? a) Permittivity b) Permeability c) Polarisation d) Polarizability

Last Answer : a) Permittivity

Description : Zero permeability/permittivity implies which state? a) No ions are allowed in the medium b) No current is generated in the medium c) No magnetic or electric energy is permitted in the medium d) No resistivity

Last Answer : c) No magnetic or electric energy is permitted in the medium

Description : Curie-Weiss law is used to calculate which one of the following? a) Permittivity b) Permeability c) Electric susceptibility d) Magnetic susceptibility

Last Answer : d) Magnetic susceptibility

Description : The superconducting materials will be independent of which of the following? a) Magnetic field b) Electric field c) Magnetization d) Temperature

Last Answer : b) Electric field

Description : The charge build up in a capacitor is due to a) Conduction current density b) Displacement current density c) Polarisation d) Magnetization

Last Answer : b) Displacement current density

Description : The refractive index of a medium with permittivity of 2 and permeability of 3 is given by a) 3.56 b) 2.45 c) 3.21 d) 1.78

Last Answer : b) 2.45

Description : The relation between the speed of light, permeability and permittivity is a) C = 1/√(με) b) C = με c) C = μ/ε d) C = 1/με

Last Answer : a) C = 1/√(με)

Description : Which parameter is unity in air medium? a) Permittivity b) Absolute permeability c) Relative permeability d) Permeability

Last Answer : c) Relative permeability

Description : In free space, which parameter will be unity? a) Permittivity b) Absolute permittivity c) Relative permittivity d) Permeability

Last Answer : c) Relative permittivity

Description : The intrinsic impedance is the ratio of square root of a) Permittivity to permeability b) Permeability to permittivity c) Phase constant to wavelength d) Wavelength to phase constant

Last Answer : b) Permeability to permittivity

Description : For a perfect dielectric, which parameter will be zero? a) Conductivity b) Frequency c) Permittivity d) Permeability

Last Answer : a) Conductivity

Description : The permeability and permittivity of air or free space is unity. State true/false. a) True b) False

Last Answer : a) True

Description : In free space, which of the following will be zero? a) Permittivity b) Permeability c) Conductivity d) Resistivity

Last Answer : c) Conductivity

Description : Gauss law can be used to compute which of the following? a) Permittivity b) Permeability c) Radius of Gaussian surface d) Electric potential

Last Answer : c) Radius of Gaussian surface

Description : The electric flux density is the a) Product of permittivity and electric field intensity b) Product of number of flux lines and permittivity c) Product of permeability and electric field intensity d) Product of number of flux lines and permeability

Last Answer : a) Product of permittivity and electric field intensity

Description : The tangential component of the magnetic field intensity is continuous at the boundary of separation of two media. State True/False. a) True b) False

Last Answer : a) True

Description : The normal component of magnetic field intensity at the boundary of separation of the medium will be a) Same b) Different c) Negative d) Inverse

Last Answer : a) Same

Description : Calculate the frequency at which the conduction and displacement currents become equal with unity conductivity in a material of permittivity 2. a) 18 GHz b) 9 GHz c) 36 GHz d) 24 GHz

Last Answer : b) 9 GHz

Description : The energy in a magnetic material is due to which process? a) Emf b) Magnetization c) Magnetostriction d) Polarization

Last Answer : b) Magnetization

Description : Find the magnetic moment of a material with magnetization 5 units in a volume of 35 units. a) 7 b) 1/7 c) 15 d) 175

Last Answer : d) 175

Description : Find the magnetization of the material with susceptibility of 6 units and magnetic field intensity of 13 units. a) 2.16 b) 6.2 c) 78 d) 1.3

Last Answer : c) 78

Description : The converse of magnetostriction is called the a) Magnetization b) Magnetic anisotropy c) Villari effect d) Curie effect

Last Answer : c) Villari effect

Description : Find the magnetization of the field which has a magnetic moment 16 units in a volume of 1.2 units. a) 16.67 b) 13.33 c) 15.56 d) 18.87

Last Answer : b) 13.33

Description : The magnetization is defined by the ratio of a) Magnetic moment to area b) Magnetic moment to volume c) Magnetic flux density to area d) Magnetic flux density to volume

Last Answer : b) Magnetic moment to volume

Description : The inductance is the measure of a) Electric charges stored by the material b) Emf generated by energising the coil c) Magnetic field stored by the material d) Magnetization of dipoles

Last Answer : c) Magnetic field stored by the material

Description : Debye is the unit used to measure a) Permittivity b) Electric dipole moment c) Magnetic dipole moment d) Susceptibility

Last Answer : b) Electric dipole moment

Description : Materials that retain a large part of their magnetization, after the magnetizing force is removed, are said to have _____________. A. low hysteresis loss B. high flux density C. high permanence D. high permeability

Last Answer : Answer: C

Description : Find the correct relation between current density and magnetization. a) J = Grad(M) b) J = Div(M) c) J = Curl(M) d) M = Curl(J)

Last Answer : c) J = Curl(M)

Description : Calculate the magnetization of a material with susceptibility of 50 and field intensity of 0.25 units. a) 12.5 b) 25 c) 75 d) 37.5

Last Answer : a) 12.5

Description : The expression for magnetization is given by(I-current, A-area, V-volume) a) M = IAV b) M = IA/V c) M = V/IA d) M = 1/IAV

Last Answer : b) M = IA/V

Description : Piezoelectric effect is analogous to which phenomenon? a) Electrostriction b) Magnetostriction c) Anisotropy d) Magnetization

Last Answer : b) Magnetostriction

Description : Find the internal field when the applied field is 12 units, molecular field constant is 0.1 units and the magnetization is 74 units. a) 86 b) 62 c) 752 d) 19.4

Last Answer : d) 19.4

Description : When a dielectric loses its dielectric property, the phenomenon is called a) Dielectric loss b) Dielectric breakdown c) Polarisation d) Magnetization

Last Answer : b) Dielectric breakdown

Description : The magnitude of the conduction current density for a magnetic field intensity of a vector yi + zj + xk will be a) 1.414 b) 1.732 c) -1.414 d) -1.732

Last Answer : b) 1.732

Description : When the conduction current density and displacement current density are same, the dissipation factor will be a) Zero b) Minimum c) Maximum d) Unity

Last Answer : d) Unity

Description : The skin depth is used to find which parameter? a) DC resistance b) AC resistance c) Permittivity d) Potential

Last Answer : b) AC resistance

Description : Find the relative permittivity of the medium having a refractive index of 1.6 a) 0.4 b) 2.56 c) 3.2 d) 4.8

Last Answer : b) 2.56

Description : Find the Brewster angle of a wave transmitted from a medium of permittivity 4 to a medium of permittivity 2. a) 35.26 b) 53.62 c) 26.35 d) 62.53

Last Answer : a) 35.26

Description : The refractive index of a material with permittivity 16 is given by a) 16 b) 256 c) 4 d) 8

Last Answer : c) 4

Description : The total permittivity of a dielectric transformer oil (relative permittivity is 2.2) will be (in order 10 -11 ) a) 1.94 b) 19.4 c) 0.194 d) 194

Last Answer : a) 1.94

Description : In metals, the total permittivity is a) Absolute permittivity b) Relative permittivity c) Product of absolute and relative permittivity d) Unity

Last Answer : a) Absolute permittivity

Description : The complex permittivity is given by 2-j. Find the loss tangent. a) 1/2 b) -1/2 c) 2 d) -2

Last Answer : a) 1/2

Description : A cable of core radius 1.25cm and impregnated paper insulation of thickness 2.13cm and relative permittivity 3.5. Compute the capacitance of the cable/km(in nF) a) 195.7 b) 179.5 c) 157.9 d) 197.5

Last Answer : a) 195.7

Description : When a material has zero permittivity, the maximum potential that it can possess is a) ∞ b) -∞ c) Unity d) Zero

Last Answer : d) Zero

Description : Find the permittivity of the surface when a wave incident at an angle 60 is reflected by the surface at 45 in air. a) 1.41 b) 3.5 c) 2.2 d) 1.73

Last Answer : d) 1.73

Description : The electric field intensity of a surface with permittivity 3.5 is given by 18 units. What the field intensity of the surface in air? a) 5.14 b) 0.194 c) 63 d) 29

Last Answer : c) 63

Description : The electric flux density of a surface with permittivity of 2 is given by 12 units. What the flux density of the surface in air? a) 24 b) 6 c) 1/6 d) 0

Last Answer : b) 6

Description : Choose the best definition of dielectric loss. a) Absorption of electric energy by dielectric in an AC field b) Dissipation of electric energy by dielectric in a static field c) Dissipation of heat by dielectric d) Product of loss tangent and relative permittivity

Last Answer : a) Absorption of electric energy by dielectric in an AC field

Description : The permittivity is also called a) Electrostatic energy b) Dielectric constant c) Dipole moment d) Susceptibility

Last Answer : b) Dielectric constant