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Calculate the polarisation vector in air when the susceptibility is 5 and electric field is 12 units.
c Explanation: The polarisation vector is given by, P = ε0 x χe x E, where χe = 5 and ε0 = 12. On substituting, we get P = 1 x 5 x 12 = 60 units.
c
Explanation: The polarisation vector is given by, P = ε0 x χe x E, where χe = 5 and ε0 =
12. On substituting, we get P = 1 x 5 x 12 = 60 units.
See lessdentify which type of polarisation depends on temperature.
c Explanation: The electronic, ionic and interfacial polarisation depends on the atoms which are independent with respect to temperature. Only the orientational polarisation is dependent on the temperature and is inversely proportional to it.
c
Explanation: The electronic, ionic and interfacial polarisation depends on the atoms
which are independent with respect to temperature. Only the orientational polarisation is
dependent on the temperature and is inversely proportional to it.
See lessCalculate the energy stored per unit volume in a dielectric medium due to polarisation when P = 9 units and E = 8 units.
c Explanation: The energy stored per unit volume in a dielectric medium is given by, W = 0.5 X PE = 0.5 X 9 X 8 = 36 units.
c
Explanation: The energy stored per unit volume in a dielectric medium is given by, W =
0.5 X PE = 0.5 X 9 X 8 = 36 units.
See lessPolarizability is defined as the
b Explanation: Polarizability is a constant that is defined as the ratio of elemental dipole moment to the electric field strength.
b
Explanation: Polarizability is a constant that is defined as the ratio of elemental dipole
moment to the electric field strength.
See lessCalculate the polarisation vector of the material which has 100 dipoles per unit volume in a volume of 2 units.
a Explanation: Polarisation vector P = N x p, where N = 100 and p = 2. On substituting we get P = 200 units
a
Explanation: Polarisation vector P = N x p, where N = 100 and p = 2. On substituting we
get P = 200 units
See lessThe best definition of polarisation is
b Explanation: The polarisation is defined mathematically as the electric dipole moment per unit volume. It is also referred to as the orientation of the dipoles in the direction of applied electric field
b
Explanation: The polarisation is defined mathematically as the electric dipole moment
per unit volume. It is also referred to as the orientation of the dipoles in the direction of
applied electric field
See lessThe intrinsic impedance of free space is given by
d Explanation: The intrinsic impedance is given by η = √(μo/εo) ohm. Here εo = 8.854 x 10 - 12 and μo = 4π x 10 -7 . On substituting the values, we get η = 377 ohm
d
Explanation: The intrinsic impedance is given by η = √(μo/εo) ohm. Here εo = 8.854 x 10
–
12 and μo = 4π x 10
-7
.
On substituting the values, we get η = 377 ohm
See lessIf the intrinsic angle is 20, then find the loss tangent.
b Explanation: The loss tangent is given by tan 2θn, where θn = 20. Thus the loss tangent will be tan 40
b
Explanation: The loss tangent is given by tan 2θn, where θn = 20. Thus the loss tangent
will be tan 40
See lessIn free space, which of the following will be zero?
c Explanation: In free space, ε = ε0 and μ = μ0. The relative permittivity and permeability will be unity. Since the free space will contain no charges in it, the conductivity will be zero.
c
Explanation: In free space, ε = ε0 and μ = μ0. The relative permittivity and permeability
will be unity. Since the free space will contain no charges in it, the conductivity will be
zero.
See lessIn good conductors, the electric and magnetic fields will be
b Explanation: The electric and magnetic fields will be out of phase by 45 in good conductors. This is because their intrinsic impedance is given by η = √(ωμ/σ) X (1+j). In polar form we get 45 out of phase.
b
Explanation: The electric and magnetic fields will be out of phase by 45 in good
conductors. This is because their intrinsic impedance is given by η = √(ωμ/σ) X (1+j). In
polar form we get 45 out of phase.
See less