If Si is doped with B ,

Step-by-step solution

(b) : Silicon belongs to group 14 , it is doped with a group 13 element like B which contains only three valence electrons. The place where the fourth valence e⁻ is missing is called electron hole. Under the electric field, e⁻ holes moves toward the negatively charged plate, which implies that e⁻ holes are positively charged, thus it is a p -type semiconductor.