If the energy loss due to sudden enlargement in a pipe is expressed as \({h_e} = {k_e}\frac{{V_1^2}}{{2g}}\) where V1 is the velocity before expansion, then the coefficient ke is equal to
1
\(\left( {\frac{{{A_1}}}{{{A_2}}} - 1} \right)\)
2
\({\left( {1 - \frac{{{A_1}}}{{{A_2}}}} \right)^2}\)
3
\({\left( {\frac{{{A_2}}}{{{A_1}}} - 1} \right)^2}\)
4
\(\left( {1 - \frac{{{A_2}}}{{{A_1}}}} \right)\)