Final answer:
A conducting solid sphere is a type of conductor that allows the charge to move freely across its surface and distributes evenly over the outer surface of the sphere due to the repulsion between like charges.
Step-by-step explanation:
A conducting solid sphere is a type of conductor that allows the charge to move freely across its surface. When an unknown charge is placed on a conducting solid sphere, the charge distributes evenly over the outer surface of the sphere due to the repulsion between like charges. The distribution of charge on the sphere is uniform and is not affected by the amount of charge or its position on the sphere. This is known as the principle of electrostatic equilibrium.