DS
Dipole moment
p
[LTA]
C m
Vector directed
from negative to
positive charge
Charge density:
linear
l
[L–1 TA]
C m–1
 Charge/length
surface
s
[L–2 TA]
C m–2
Charge/area
volume
r
[L–3 TA]
C m–3
Charge/volume
POINTS TO PONDER
1 You might wonder why the protons, all carrying positive charges,
are compactly residing inside the nucleus Why do they not fly away You will learn that there is a third kind of a fundamental force,
called the strong force which holds them together