c
વૉલ્ટેજ વાહક \({{\rm{A}}_{\rm{V}}}\,\, = \,\,\beta \,\,\left( {\frac{{{R_0}}}{{{R_i}}}} \right)\,\, = \,\,\left( {\frac{{{i_c}}}{{{i_b}}}} \right)\,\,\left( {\frac{{{R_0}}}{{{R_i}}}} \right)\,\, = \,\,\left( {\frac{{1\,\, \times \,\,{{10}^{ - 3}}}}{{20\,\, \times \,\,{{10}^{ - 6}}}}} \right)\,\,\left( {\frac{4}{1}} \right)\,\, = \,200\)