Electric charges and fields

Created by

Riya Dsouza

Cards (34)

The unit of electric charge is coulomb (C).
The 3 properties of charge 
additive in nature
quantized
total charge in closed system is conserved
what is electrification
Method of charging a body
2 Methods of charging
by friction
by conduction
what gets transferred when particles are rubbed against each other
electrons
charge carriers of metallic conductors
electrons
Apparatus used to detect electric charge on body
gold leaf electroscope
state coulombs law
Coulomb’s law, the electrostatic force of attraction or repulsion between two charged bodies is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. It acts along the line joining the two charges considered to be point charges.
force acting along q1 due to q2
F12
force acting on q2 due to q1
F21
Coulombs law in vector form and explain terms
$F21$
q1q2>0 nature of charge?
repulsive
q1q2<0 nature of charge??
attractive
value of dielectric constant of vacuum
K=1
principle of superposition 
This principle states that the combined effect of force system acting on a particle or a rigid body is the sum of effects of individual forces.
define electric field
force experienced by a unit +ve charge
is electric field scalar or vector 
vector
SI unit of electric field
N/C
direction of electric field due to point -ve charge 
radially inward
direction of electric field due to point +ve charge
radially outward
3 properties of electric field lines
they do not intersect
do not form closed loops
crowded in the region of stronger field and spaced apart in the region of weaker field
defn of electric field lines
pictorial way of representing electric field in a given region
what is electric flux
number of field lines of force passing normally through a surface area
when is flux maximum and minimum
max when tita = 0*
min when tita = 90*
define electric dipole
pair of equal and opp charges separated by a small distance
SI unit if electric flux
Nm2C-1 or Vm
define electric dipole moment
product of magnitude of either charge or dipole length
exp for torque in uniform electric field 
t=P x E
when is torque max and min
max tita=90*
min tita=0*
define linear charge density
charge per unit length
lambda=q\L
define surface charge density
charge per unit surface
sigma=q/A
define volume charge density
charge per unit volume
rho=q/V
State gauss's law in electrostatics
Gauss’s law in electrostatics states that the electric flux passing through a closed surface in air is equal to the 1/0ϵ01 times total electric charge within the surface
define gaussian surface
the surface used to calculate electric flux and hence to apply gauss law