Electrostatics 1 Flashcards
frictional/static electricity
electricity created when objects are rub against each other.
when 2 bodies are rubbed together how are electrons transferred
From lower work function to higher
What confirm if object is charged
repulsion
electrostatic induction
phenomenon to temporarily charge the object by bringing another charged object near it.
electric charge
intrinsive property of primary elements(p and e) that gives rise to electric forces between them.
quantization of charge
the charge is always integral multiple of basic quantum charge (e), i.e. charge on electron.
charge on body Q is given by
Q=ne
n= whole no., e= electronic charge i.e. 1.6x10^-19
Which is bigger a coulomb or charge on electron
coulomb is bigger
n=q/e =1c/ 1.6x10^-19= 6.25x 10^18
coulomb’s law
2 charges repel/ attract with force that is directly proportional to product of their magnitude and inversely prop. to the distance between them
Formula of coulomb’s law
F= kq1q1/r^2
where K is constant of propotionality
Coulombs law in CGS syatem
k=1 therefore F= q1q2/r^2
value of k in SI system
1/4πεo
1/4πεo is
9x10^9
define 1 coulomb
The charge that repels equal and similar charge wiht a force of 9x10^9 newton when placed in air t a distance of 1 m
unit of charge in CGS
e.s.u
When is charge said to be 1 e.s.u
When it repels same charge with force of 1 dyne placed at a distance of 1cm in air
define dielectric cons.t or relative permittivity(k)
it is the ratio of force between charges in air to the ratio of forces between the same distance in medium.
coulomb’s law in vector form
F21= - F12
superposition principle
when no of charges are present the total charge is given by their vector at individual forces exerted on a certain charge by other charges
what can superposition principle used for
net force, net field, net flux
