Electrostats Flashcards
Electrostatics
Study of interaction between stationary electrically charged particles
Electrostatics law
Deals with attractive and repulsive forces that exist between pos and neg charged particles
Elec charge
Property of sub atomic particles that causes it to experience forces when placed in an electric and magnetic field
Conductor
Any material that allows electric current to pass through it
Insulator
Any material that doesn’t allow electric current to pass through it
Unit
Coulumb
Charged of elec: 1.6×10 –¹⁹C neg charged
One C has 6.25×10¹⁸ elec
Conservation of elec charge
Total amt of charge in an isolated system remains constant
Coulumbs law
The electrostatic force of attraction between two point charges is dir proportional to the prod of charges and inversely prop to the sq of dist between them, force acts along the line joining the two charges
Unit of k (prop const)
9×10⁹ Nm²/C²
Permittivity of free space epsilon not
C²/Nm² , val 8.85×10–¹²
Epsilon not used in vacuum
Epsilon used in medium
Epsilon (absolute permittivity of material medium)
e = Kenot
K != k
K= Dielectric constant/relative permittivity/specific inductive capacity
K=e/e°
Elec dipole and elec dipole moment
Ed: pair of equal and opposite point charges placed at a short dist apart
EdM: period of one charge and the distance between the charges
P=q×2l
Elec lines of force
Imaginary smooth curves drawn in an electric field along which a few isolated pos charge moves.
Prop:
FL originates on + and ends at -
Tangent drawn to field line gives dir
Two fl can never intersect each other
Do not pass through cond so EF in cond always zero
FL close EF close n strong n vice versa
FL r closed and continuous
Elec lines of force
Imaginary smooth curves drawn in an electric field along which a few isolated pos charge moves.
Prop:
FL originates on + and ends at -
Elec field
Space surrounding a charge q in which another charge q° experiences a electrostatics force
E=F/q°
Unit= N/C or V/m
F=qE
Q=ne
Millikan exp qE=mg
