Suppose that a conducting sphere is charged positively by some method. The charge is initially deposited on the left side of the sphere. Yet because the object is conductive, the charge spreads uniformly throughout the surface of the sphere. The uniform distribution of charge is explained by the fact that .

electrons will migrate untill there is uniform distribution of  charge .

and sphere became uniformly charged

Explanation:

as conducting sphere is charged positively it is given . the left side of sphere is charged positively . there is negative charge on the left side that will be attracted by positive charge of right side .

therefore electrons from left side will start migrate towards right side due to attraction of positive charge of right side .

therefore electron will start migrate uniformly .

electrons will migrate untill there is uniform distribution of  charge .

and sphere became uniformly charged