A positive point charge $)=(+5\mathrm{.}60{10}^{-8}C$ is surrounded by an equipotential surface $A,$ which has a radius of $r_A=1\mathrm{.}93m.$ A positive test charge $)=(+4\mathrm{.}40{10}^{-11}C$ moves from surface $A$ to another equipotential surface $B,$ which has a radius $r_B.$ The work done by the electric force as the test charge moves from surface $A$ to surface $B$ is $W_{AB}=-7\mathrm{.}52{10}^{-9}J.$ Find $r_B.$

$r_B=$

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