In a galvanometer, there is deflection of 5 divisions per $\mathrm{\mu }$A current. The resistance of galvanometers is 40 ohm. If shunt of 2 ohm is connected and if there are 50 divisions all over the scale of galvanometer, then the maximum current that can be measured by it is

$\begin{array}{rcl}\mathrm{s}& =& \frac{\mathrm{G}}{\mathrm{n}-1} \mathrm{where} \mathrm{G} \mathrm{is} \mathrm{the} \mathrm{galvanometer} \mathrm{resistance} \\ & & \mathrm{and} \mathrm{n} \mathrm{is} \mathrm{the} \mathrm{amplification} \mathrm{factor}\\ 2& =& \frac{40}{\mathrm{n}-1}; \mathrm{n}=21\\ & & \end{array}$

$\begin{array}{rcl}\begin{array}{lcl} & & \mathrm{before}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{connecting}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{shunt}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{it}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{measures}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{a}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{current}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{of}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & 50\end{array}\begin{array}{rcl} & & \times \end{array}\begin{array}{rcl} & & \frac{1}{5}\end{array}& =& \begin{array}{rcl} & & 10\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{\mu A}\end{array}\begin{array}{rcl} & & \end{array}\\ \begin{array}{rcl} & & \mathrm{now}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{it}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{measures}\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & 21\end{array}\begin{array}{rcl} & & \times \end{array}\begin{array}{rcl} & & 10\end{array}& =& \begin{array}{rcl} & & 210\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{\mu A}\end{array}=\begin{array}{rcl} & & 0\end{array}\begin{array}{rcl} & & .\end{array}\begin{array}{rcl} & & 21\end{array}\begin{array}{rcl} & & \end{array}\begin{array}{rcl} & & \mathrm{mA}\end{array}\end{array}$