If N_p and N_e be the numbers of holes and conduction electrons in an extrinsic semiconductor, then :

• A

  ${\mathrm{N}}_{\mathrm{p}}>{\mathrm{N}}_{\mathrm{e}}$

• B

  ${\mathrm{N}}_{\mathrm{p}}={\mathrm{N}}_{\mathrm{e}}$

• C

  ${\mathrm{N}}_{\mathrm{p}}<{\mathrm{N}}_{\mathrm{e}}$

• D

  N_p < N_e or N_p > N_e depending on the nature of impurity.