Is the electric field due to a point charge q1 on another point charge q2 equal and opposite to the

No,

Electric field due to a point charge q at a distance r is given by,

kq/r².

So at any location r the electric field due a charge is independent due to any other charge.

However the multiple electric fields due to multiple point charges at a point get added.

Regards,

Team,

TopperLearning.