The electric field component of a time harmonic plane EM wave traveling in a nonmagnetic lossless dielectric medium has an amplitude of 1 V/m. If the relative permittivity of the medium is 4, the magnitude of the time-average power density vector (in W/m2) is
Answer : Option CExplaination / Solution:
Intrinsic impedance of EM wave
Q2.Two infinitely long wires carrying current are as shown in the figure below. One wire is in the y - z plane and parallel to the y axis. The other wire is in the x - y plane and parallel to the x - axis. Which components of the resultingmagnetic field are non-zero at the origin ?
Answer : Option DExplaination / Solution:
Due to 1 A current wire in x - y plane, magnetic field be at origin will be in x direction. Due to 1 A current wire in y - z plane, magnetic field be at origin will be in z direction. Thus x and z component is non-zero at origin.
Q3.If a vector field is related to another vector field through which of the following is true? (Note : C and SC refer to any closed contour and any surface whose boundary is C . )
Q4.A plane wave having the electric field components V/m and traveling in free space is incident normally on a lossless medium with which occupies the region y ≥ 0. The reflected magnetic field component is given by
Answer : Option AExplaination / Solution:
In the given problem
Reflection coefficient
negative So magnetic field component does not change its direction Direction of incident magnetic field
The silicon sample with unit cross-sectional area shown below is in thermal equilibrium. The following information is given: T = 300 K electronic charge = 1.6 × 10-19 C, thermal voltage = 26 mV and electron mobility = 1350 cm2 / V-s
The magnitude of the electric field at x = 0.5 μm is
Answer : Option CExplaination / Solution: No Explaination.
The silicon sample with unit cross-sectional area shown below is in thermal equilibrium. The following information is given: T = 300 K electronic charge = 1.6 × 10-19 C, thermal voltage = 26 mV and electron mobility = 1350 cm2 / V-s
The magnitude of the electron of the electron drift current density at x = 0.5 μm is
Answer : Option AExplaination / Solution:
Electron drift current density
Q7.The expression for an electric field in free space is where x, y, z represent the spatial coordinates, t represents time, and 𝜔,k are constants. This electric field
Consider a straight, infinitely long, current carrying conductor lying on the z-axis. Which one of the following plots (in linear scale) qualitatively represents the dependence of Hϕ on r , where Hϕ is the magnitude of the azimuthal component of magnetic field outside the conductor and r is the radial distance from the conductor ?
Answer : Option CExplaination / Solution: No Explaination.