Read the passage and answer the question(s).

The potential at any point P of a static electric field is defined as the work done by an external agent in slowly bringing a unit positive charge from infinity to that point. Figure shows potential variation along the line of charges. Two point charges Q₁ and Q₂ lie along a line at some distance from each other. 

Which of the two charges has greater magnitude?

Q₁

The net potential due to the two charges is positive in region left to Q₁