A positive charge +q1 is located to the left of negative charge -q2. On a line passing through the two charges, there are two places where the total potential is zero. The first place is between the charges and is 5cm to the left of the negative charge. The second place is 10cm to the right of the negative charge.
a) Find the distance between the two charges
b) Find q1/q2, the ratio of the magnitudes of the charges.