Two charged smoke particles exert a force of 4.2x10^-2 N on each other. What will be the force if they are moved so they are only one eighth as far apart?

F= 4.2x10^-2 N
K= 8.99x10^9
e= 1.6x10^-19

Do I solve for r even though they're asking me to find the force?

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