[单选题]
Two positive charges of magnitude 2C and 8f1ukk; h6 v)fh )vt-m8yuqe ;gC respectively are placed 9cm apab(n- k8;h kk0iyeznila+f5n 8 tt6 9yprt. A third charge is introduced between 6 i t9b p;kk(8t hly0ke5-+ny8iafn nzthe two charges as shown below;
At what separation, X, from the 2C charge is the electric field strength equal to zero?
