A point positive charge is brought near an isolated conducting sphere as shown in figure the electric field is best given by

Options

A.
B.
C.
D.

Answer

a

Explanation

When 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. This leaves an excess of positive charge on the rear (right) surface of sphere.
Both kinds of charges are bound in the metal sphere and cannot escape They, thereofre, reside on the surface. ltBrgt 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 given in the figure below ltBrgt
An electric field lines start from positive charge and ends at negative charge (in this case from point positive charge to negative charge created inside the sphere). ltBrgt Also, electric field line emerges from a positive charge, in case of single charge and ends at infinity. ltBrgt Here, all these conditions are fulfilled in fig. (a).