Three charged particles are placed on a straight line as shown in figure. \( q_{1} \) and \( q_{...

Three charged particles are placed on a straight line as shown in figure. \( q_{1} \) and \( q_{2} \) are fixed, but \( q_{3} \) can be moved. Under the action of the forces from \( q_{1} \) and \( q_{2}, q_{3} \) is in equilibrium. What is the relation between \( q_{1} \) and \( q_{2} \) ?
(1) \( q_{1}=4 q_{2} \)
(2) \( q_{1}=-q_{2} \)
(3) \( q_{1}=-4 q_{2} \)
(4) \( q_{1}=q_{2} \)