In above 3 figures, the arrows indicate the direction of force and magnitude of the force is written above/below the arrows.
Which box is experiencing balanced forces?
Box iii
Equal forces acting in opposite direction will cancel each other and the block will not move. Such forces are called balanced forces. If the block is either pulled or pushed from both the sides with equal forces, the block will not move. Such forces are called balanced forces and do not change the state of rest or of motion of an object
Case i – The pull forces are acting in opposite direction but the magnitude of forces is not same. Thus the forces are unbalanced forces.
Case ii- Though the magnitudes are same, the forces are in the same direction, thus they do not cancel each other. The forces are unbalanced.
Case iii- Though the arrows are shown on the same side, the direction of the arrows are opposite. And the magnitudes of forces are equal. Thus the forces cancel out each other. Hence the forces are balanced.
So the correct option is C.