A point charge is brought in an electric field. The electric field at a near by point

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 kind of charges are bound in the metal 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 given in the figure below

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).
Also, electric field line emerges from a positive charge, in case of single charge and ends at infinity.
Here, all these conditions are fulfilled in Fig. (A).