Multiple Choice $7$ points

A charge is located at the center of sphere A $($radius $R_A=0\mathrm{.}10cm),$ which is in the center of sphere B $($radius $R_B=1\mathrm{.}2mm).$ Spheres A and B are both equipotential surfaces. What is th ratio $\frac{V_A}{V_B}$ of the potentials of these surfaces?

$1\mathrm{.}2$

$1\mathrm{.}4$

$2\mathrm{.}4$

$0\mathrm{.}42$

$0\mathrm{.}83$

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