question_answer

In \[{{\mu }_{e}}\]and \[{{\mu }_{h}}\] are electron and hole mobility. E   be the applied electric field, the current density \[\tau \] for intristic semiconductor is equal to

A) \[{{n}_{i}}e({{\mu }_{e}}+{{\mu }_{h}})E\]

B) \[{{n}_{i}}e({{\mu }_{e}}-{{\mu }_{h}})E\]

C) \[\frac{{{n}_{i}}e({{\mu }_{e}}-{{\mu }_{h}})}{E}\]                           

D) \[\frac{E}{{{n}_{i}}e({{\mu }_{e}}+{{\mu }_{n}})}\]