\({{\text{C}}_{total}}\,\, = \,\,\frac{{{C_1}{C_2}}}{{{C_1}\,\, + \,\,{C_2}}}\,\, = \,\,\frac{2}{3}\,\,\mu F\)
\(Q\,\, = \,\,{{\text{C}}_{total}}\,V\,\, = \,\,\frac{2}{3}\,\, \times \,\,{10^{ - 6}}\,\, \times \,\,120\,\, = \,\,80\,\, \times \,\,{10^{ - 6}}\,\,V\)
\({V_1}\,\, = \,\,\frac{Q}{{{C_1}}}\,\, = \,\,\frac{{80\,\, \times \,\,{{10}^{ - 6}}}}{{1\,\, \times \,\,{{10}^{ - 6}}}}\,\, = \,\,80\,V\)