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Find the mobility of the electrons when the drift velocity is 23 units and the electric field is 11 units.
b Explanation: The mobility is defined as the drift velocity per unit electric field. Thus μe = vd/E = 23/11 = 2.1 units.
b
Explanation: The mobility is defined as the drift velocity per unit electric field. Thus μe =
vd/E = 23/11 = 2.1 units.
See lessFind the electron density when convection current density is 120 units and the velocity is 5m/s
c Explanation: The convection current density is given by J = ρe x v. To get ρe, put J = 120 and v = 5. ρe = 120/5 = 24 units
c
Explanation: The convection current density is given by J = ρe x v. To get ρe, put J =
120 and v = 5. ρe = 120/5 = 24 units
See lessCompute the conductivity when the current density is 12 units and the electric field is 20 units. Also identify the nature of the material.
c Explanation: The current density is the product of conductivity and electric field intensity. J = σE. To get σ, put J = 12 and E = 20. σ = 12/20 = 0.6. Since the conductivity is less than unity, the material is a dielectric.
c
Explanation: The current density is the product of conductivity and electric field intensity.
J = σE. To get σ, put J = 12 and E = 20. σ = 12/20 = 0.6. Since the conductivity is less
than unity, the material is a dielectric.
See lessCalculate the charge density for the current density given 20sin x i + ycos z j at the origin
b Explanation: Using continuity equation, the problem can be solved. Div(J) = – dρ/dt. Div(J) = 20cos x + cos z. At origin, we get 20cos 0 + cos 0 = 21. To get ρ, on integrating the Div(J) with respect to t, the charge density will be 21t
b
Explanation: Using continuity equation, the problem can be solved. Div(J) =
– dρ/dt. Div(J) = 20cos x + cos z. At origin, we get 20cos 0 + cos 0 = 21. To get ρ, on
integrating the Div(J) with respect to t, the charge density will be 21t
See lessThe continuity equation is a combination of which of the two laws?
b Explanation: I = ∫ J.ds is the integral form of Ohm’s law and Div (J) = dq/dt is the Gauss law analogous to D. Through these two equations, we get Div(J) = -dρ/dt. This is the continuity equation.
b
Explanation: I = ∫ J.ds is the integral form of Ohm’s law and Div (J) = dq/dt is the Gauss
law analogous to D. Through these two equations, we get Div(J) = -dρ/dt. This is the
continuity equation.
See lessFind the current when the charge is a time function given by q(t) = 3t + t 2 at 2 seconds.
c Explanation: The current is defined as the rate of change of charge in a circuit ie, I = dq/dt. On differentiating the charge with respect to time, we get 3 + 2t. At time t = 2s, I = 7A
c
Explanation: The current is defined as the rate of change of charge in a circuit ie, I =
dq/dt. On differentiating the charge with respect to time, we get 3 + 2t. At time t = 2s, I =
7A
See lessCompute the loss factor when the loss tangent is 0.88 and the real part of dielectric is 24.
d Explanation: The loss factor is nothing but the imaginary part of AC dielectric. It is given by, ε“ = ε` tan δ. We get loss factor as 24 x 0.88 = 21.12.
d
Explanation: The loss factor is nothing but the imaginary part of AC dielectric. It is given
by, ε“ = ε` tan δ. We get loss factor as 24 x 0.88 = 21.12.
See lessChoose the best definition of dielectric loss
a Explanation: In the scenario of an AC field, the absorption of electrical energy by a dielectric material is called as dielectric loss. This will result in dissipation of energy in the form of heat.
a
Explanation: In the scenario of an AC field, the absorption of electrical energy by a
dielectric material is called as dielectric loss. This will result in dissipation of energy in
the form of heat.
See lessWhen a dielectric loses its dielectric property, the phenomenon is called
b Explanation: Due to various treatments performed on the dielectric, in order to make it conduct, the dielectric reaches a state, where it loses its dielectric property and starts to conduct. This phenomenon is called as dielectric breakdown.
b
Explanation: Due to various treatments performed on the dielectric, in order to make it
conduct, the dielectric reaches a state, where it loses its dielectric property and starts to
conduct. This phenomenon is called as dielectric breakdown.
See lessCalculate the loss tangent when the dielectric constant in AC field is given by 3 + 2j.
d Explanation: The AC dielectric constant is given by εr = ε` – jε“, where ε` is the real part of AC dielectric and ε“ is the imaginary part of AC dielectric. The loss tangent is given by tan δ = ε“/ε` = -2/3.
d
Explanation: The AC dielectric constant is given by εr = ε` – jε“, where ε` is the real part
of AC dielectric and ε“ is the imaginary part of AC dielectric. The loss tangent is given by
tan δ = ε“/ε` = -2/3.
See less