^Relations between AU, Ly and parsec
^Relations between AU, Ly and parsec
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^Parsec
^Parsec Parsec is an abbreviation of parallatic second. One parsec is the distance at which an arc of length one astronomical unit subtends an angle of 1 s, (by definition when L = 1 AU, q = 1 “, r = 1 parsec)
^Isolated spherical conductor
Isolated spherical conductor 1. Capacitance of an isolated spherical conductor of radius ‘a’ is Cearth = 4 πε0 a 2. As C ∝ a, thus big spheres have more capacitance than small spheres. 3. If the spherical isolated conductor is earthed, then entire charge leaks to earth, making its potential zero & thus C = […]
^Light year (ly)
^Light year (ly) It is the distance travelled by light in vacuum (with a speed of 3 x 108 m/s) in one year (i.e., 365 x 24 x 60 x 60 s). 1 ly = 3 x 108 x (365 x 24 x 60 x 60) » 9.5 x 1015 m
^Astronomical Unit (AU)
^Astronomical Unit (AU) It is the mean distance of the Earth from the Sun. 1 AU = 1.496 x 1011 m » 1.5 x 1011 m
^PPC with a metal slab in plates
PPC with a metal slab in plates If a metal slab (dielectric constant K = ∞), thickness t < d is placed between the plates of a PPC, then due to the electric field between the capacitor plates the dielectric gets polarized & an electric equal to E0 is induced in it, as a consequence […]
^What is a Tensor?
^What is a Tensor? A physical quantities which have no specified direction but different values in different directions are called tensors. Stress, Strain, Density, dielectric constant, refractive index, electrical conductivity, electrical resistivity, moment of inertia etc are tensors. These quantities are taken as tensors at microscopic level & scalars macroscopically. Following practical units of length […]
^What is a ratio?
^What is a ratio? If a physical quantity can be completely described just by knowing its only numerical value, no unit & direction is required, then it is called ratio. e.g. Strain, Poisson’s ratio, refractive index, relative density, relative permittivity, relative permeability, fine structure constant etc.
^What is a vector?
^What is a vector? If both magnitude and direction are required to completely described a physical quantity, then it is called a vector. A vector quantity is represented by putting on arrow above it or by bold letter e.g. it Q is vector then we represent it as or Q. if a quantity can have […]
^PPC with a dielectric slab in plates
PPC with a dielectric slab in plates If a dielectric slab of dielectric constant K, thickness t < d is placed between the plates of a PPC then due to the electric field between the capacitor plates the dielectric gets polarized & an electric is induced in it, as a consequence net electric field in […]
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