SOLUTION

As a general rule, holes are found only in semiconductors.

⇒ The electrons and holes formed by the addition of the donor and acceptor impurities are called majority carriers.

⇒ As the name implies, these carriers are responsible for most of the current in the extrinsic semiconductor material and lower the resistivity considerably.

⇒ In addition to the majority carriers, there are a small number of free electrons in p-type material and a small number of free holes in n-type material, produced by thermal agitation of the atoms in the crystal as mentioned previously.

⇒ These electrons and holes are also available to carry a current and are called minority carriers.