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The flux 0.5 m from the center of a charged isolated conducting sphere is $+2.0\times 10^{6}Nm^2/C$.

If the radius of the sphere is 0.25 m, what is the total charge on the conducting sphere?

$4.2\times 10^{-5} C$

$3.22\times 10^{-5} C$

$1.77\times 10^{-10} C$

$1.77\times 10^{-5} C$