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SI unit of charge
CGS unit of charge
Coulomb (C)
Stat coulomb
1 C =
3 × 10−19 stat coulomb
1 e−1
-1.6 × 10−19 C
1 P
1.6 × 10−19 C
Mass of proton
1.67 × 10−27 Kg
Mass of electron
9.1 × 10−31 Kg
Value of electrostatic force constant ( K)
9×109
Value of ε node
8.854×10−12
Unit of K
C2Nm2
Dimension of K
ML3T−4A−2
Unit of €°
Nm2C−21
Dimension of €°
M−1L−3T4A2
1μ c
1 nc
1 pc
10−6
10−9
10−12
Formula of electric field intensity
E=qF
Dimension of electric field
MLT−3A−1
Electric field is which quantity
Vector
Electric field lines flow from
+——>-
Dipole moment
P=q×2l
Unit of dipole moment
Cm
Dimension of dipole moment
ATL
Electric field due to a point charge
E=r2kq
Electric field intensity due to dipole at centre
E=l22kq
Electric field intensity due to dipole on an axial line
E=r32kP
Relation of E and r
E=r21
Electric field intensity due to dipole on equatorial line
E=r3KP
Imp
Eaxial = 2 × Equatorial
Torque on dipole is
τ=P×E
τ= PEsinθ
Angle when dipole is parallel to electric field
0o
Torque when dipole is parallel to el. Field
Zero
Tau = 0
Stable equilibrium
Tau = 180
Unstable equilibrium
Tau = 90
Maximum torque
Electric flux
ϕ=E⋅ds
ϕ=Edscosθ
SI unit of electric flux
ϕ=CNm2
Dimension of Electric flux
ML3T−3A−1
Linear charge density λ
λ=lq
S.I unit = C/m
Dimension = ATL−1
Surface charge density σ
σ=AQ
S.I unit = C/m2
Dimension = ATL−2
Volume charge density ρ
ρ=vol.Q
S.I = m3C
Dimension= ATL−3
Gauss theorem
ϕ=∮E⋅ds=ε.Q
Electric field intensity due to infinetly long wire
E=2πrε.λ
Electric field due to thin infinite plane sheet
E=2ε.σ
Electric field due to uniformly charged spherical shell
E=ε.σ