disp("Part a");
q1=0.25*10^(-6);
q2=q1;
k=9*10^9;
r=3*10^(-2);
f=k*q1*q2/r^2;
disp("the force of repulsion (in N) is "); disp(f);
disp("Part b");
f1=f/4.45;
disp("the force of repulsion (in lb) is"); disp(f1);