If a positive point charge is brought near an isolated conducting sphere without touching the sphere, then the free electrons in the sphere are attracted towards the positive Charge and electric field passes through a charged body. This leaves an excess of positive charge on the (right) surface of sphere due to the induction process. Both type of charges are bound in the (isolated conducting) sphere and cannot escape. They, therefore, reside on the surface.
Thus, the left surface of sphere has an excess of negative charge and the right surface of sphere has an excess of positive charge as shown in figure.


An electric field lines start from positive charge and ends at negative charge.
Also, electric field line emerges from a positive charge, in case of single charge and ends at infinity shown in figure
(a).