Thus,
(a) PQ1 and PQ2
(b) (i) PQ3, PQ6 (stable); (ii) PQ5, PQ4 (unstable)
(c) PQ6
5 3  MAGNETISM AND GAUSS’S LAW
In Chapter 1, we studied Gauss’s law for electrostatics In Fig 5 3(c), we see that for a closed surface represented
by  i , the number of lines leaving the surface is equal to
the number of lines entering it