At what distance from a 1.00*10^-5 C charge will the electric potential be 10000 V? (Unit = m)​

I’m not sure about this question

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

Ithink it’s b hope it