#include <stdio.h>
#include <math.h>
#define  K 8.9875e9
int main (void) {
	double q1 ,q2 ,r ,f ;
	printf("Enter th charges q1 (in coulumbs):");
	scanf("%le",&q1);
	printf("Enter the  distance between the charges (In meters) :");
scanf("%le",&r);
printf("Enter the  force between the charges (In Newtons) :");
scanf("%le",&f);
q2=(f*r*r)/(K*q1);
printf("charge2=%le",q2);
return 0;
}
