Question 1151558
.
<pre>

Your basic equation is


    {{{Q[1]/R[1]^2}}} = {{{Q[2]/R[2]^2}}}   (from the Coulomb law). 


You have all the data to complete your calculation.


Substitute and find {{{Q[2]}}}.
</pre>

------------


Note:  &nbsp;&nbsp;{{{Q[2]}}} is positively charged.


On Coulomb law see this Wikipedia article


<pre>
    https://en.wikipedia.org/wiki/Coulomb%27s_law
</pre>