Elex 3000 Flashcards
law that describes the force of attraction or repulsion between two charges is directly proportional to their strengths and inversely proportional to the square of the distance between them. The basic law for interaction of charged bodies at rest
Coulomb’s Law
law that describes the force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.
Coulomb’s first law of electrostatics
law that describes the force of attraction or repulsion between poles is inversely proportional to the square of the distance between them
Coulomb’s second law of electrostatics
The summation of the normal component of the electric field displacement E over any closed surface is directly proportional to the electric charge within the surface.
Gauss’s Law
Diamagnetic
Diamond
capacitor-store higher amount of energy
Mica capacitor
vanishes above ferro-electric Curie temperature
Spontaneous polarization
permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
paramagnetic materials
Assertion (A): Atomic number of sodium is 11.
Reason (R): Sodium has a body centred cubic lattice.
Both A and R are true but R is not correct explanation of A
Atomic number is not dependent on lattice structure.
The conductivity of intrinsic semiconductor is given by
eni(μp + μn)
Conductivity = (Electron charge) x (Number of charge carriers) x (Sum of mobilities of holes and electrons).
The number of valence electrons in pentavalent impurity is
5
If the diameter of a wire is doubled, its current carrying capacity becomes
four times
Current carrying capacity depends on area of cross-section.
The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is
Ohm’s law
Material which lack permanent magnetic dipoles are known as
diamagnetic
