Question

A doped semiconductor is electrically neutral.

Hint:

Doping a semiconductor introduces charge carriers, but the total number of positive and negative charges remains balanced, ensuring electrical neutrality.

Answer 1

A doped semiconductor is obtained by adding impurities to an intrinsic semiconductor. The impurities add extra electrons (n-type doping) or create holes (p-type doping), but the number of positive charges (protons) in the semiconductor remains unchanged.
Even though doping introduces additional free charge carriers (electrons or holes), the number of positive and negative charges are balanced in the overall semiconductor. As a result, the net charge of the doped semiconductor remains zero, making it electrically neutral.