The flux through a closed surface in that case is
given by
E ∆S
=
∑
q
ε0
 EXAMPLE 5 2
Rationalised 2023-24
143
Magnetism and
Matter
where q is the electric charge enclosed by the surface The difference between the Gauss’s law of magnetism and that for
electrostatics is a reflection of the fact that isolated magnetic poles (also
called monopoles) are not known to exist