Three infinitely long linear charges of charge density $\lambda $ , $\lambda $ and $-2\lambda $ are placed in space. A point in space is specified by its perpendicular distance $r_1 , r_2 $ and $ r_3$ respectively from the linear charges. For the points which are equipotential
  • A$\frac{{{r_1}{r_2}}}{{r_3^2}} = $ constant
  • B${r_1}{r_2}{r_3}^2 = $ constant
  • C${r_1}{r_2}{r_3}^{1/2} = $ constant
  • D${r_1}{r_2}{r_3} = $ constant
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