Electrostatics -I
Charge
Coulomb law is employed in
F1 = -F2
For a charge Q1, the effect of charge Q2 on Q1 will be,
North to South Pole
The direction of magnetic lines of force is from
Divergent
In a medium other than air, the electric flux density will be
σ/ωε > 1
For conductors, the conductivity will be maximum. Thus the loss tangent is greater than unity.
dV = dx dy dz
The volume of a parallelepiped in Cartesian is
Spherical
The Gaussian surface for a point charge will be
mmf
In magnetic circuits,H= ..... lines per unit length ofcore
Displacement current density
The charge build up in a capacitor is due to
Infinity
For metals, the conductivity will be
Force per unit charge on a test charge
The electric field intensity is defined as
Energy band gap
Which of the following properties distinguish a material as conductor, insulator and semiconductor?
Curl of H is same as the current density
Magnetic Field Intensity
Div(H) = 0
Which equation will be true, if the medium is considered to be air?
Phase and attenuation constant
In conductors, which are considered to be lossy, the attenuation and the phase constant are the same. It is given by α=β= √(ωμσ/2).
non- vector functions
Since all the coordinates in electromagnetic are space coordinates, direction and magnitude both are important.
a) Gradient
b) Divergence
c) Curl
Thus all functions are vector only.
surface to volume integral
Gauss Divergence Theorem
Lorentz force
force experienced by an electromagnetic wave in a conductor
Stokes theorem
conversion of line integral of H into surface integral
0 --- Constant
attenuation Constant in lossless dielectric
Depends on the function
The divergence theorem for a surface consisting of a sphere is computed in which coordinate system?
negative gradient
...
Unity
The permeability and permittivity of free space or air is always unity. This implies that the air is always ready to store electric or magnetic charges subjected to it.
Conductors placed in any dielectric medium
Both the conduction and displacement current densities coexist in which medium?
Conductivity is Zero
For a perfect dielectric, which parameter will be zero?