The figure shows the field lines of two point charges, $+2q$ and $-q$, at rest in vacuum. (i) Exactly half of the lines that leave $+2q$ end on $-q$. (ii) At the midpoint of the line joining the charges, the field points towards $-q$. (iii) At some point between the two charges, the electric field is zero. (iv) No two of these field lines cross each other. (v) The electric potential is zero at one point between the two charges. How many of the statements above are correct?

Fig. 1: The electric field lines of two point charges on a horizontal line: plus 2q on the left and minus q on the right, a short distance apart. Sixteen lines leave the charge plus 2q, spaced evenly in angle around it. Some of them curve round and end on the charge minus q, and the others bend away to the right and to the edges of the picture. Arrowheads on the lines point away from plus 2q.