વોલ્ટમીટરમાંથી વિધુતપ્રવાહ \(\,I\,\, = \,\,\frac{{110}}{{\left( {20\,\, \times \,\,1{0^3}\,\, + \;\,R} \right)}}\)

વોલ્ટમીટરના છેડાઓ વચ્ચે સ્થિતિમાન તફાવત \(V = IR_v\)

\( \Rightarrow \,\,5\,\, = \,\,\frac{{110\,\, \times \,\,20\,\, \times \,\,{{10}^3}}}{{\left( {20\,\, \times \,\,{{10}^3}\,\, + \;\,R} \right)}}\)

\(\, \Rightarrow \,\,20\,\, \times \,\,{10^3}\,\, + \;\,R\,\, = \,\,440\,\, \times \,\,{10^3}\)

\( \Rightarrow \,\,R\,\, = \,\,420\,\, \times \,\,{10^3}\,\,\Omega \)