Question

what is the nature of force between two point charge q1 and q2 if i.q1+q2>0 ii.q1+q2<0

Answer 1

1)Since q1,q2> 0 which clearly implies that bith chareges are positive .

As we know that like charge repel each other and unlike charge attract each other.

Therefore the nature of force is repulsive . Both the charges repel each other and the force is given by the equation

F=q1q2/4πepsilon

Hope this helps you.

2)
Standard theory has a formula (called Coulomb’s Law) for calculating the magnitude and direction of the force between two charges, but not a model that explains what charge is and why there are two polarities. As written, your question is ambiguous. If Both charges are negative - they repel, If one charge is positive, they attract.

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I hope this answer can help you