What does q1 q2 >0 signify in electrostatics

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Q. For two point charges

q_{1}

and

q_{2}

q_{1} q_{2} < 0

. What is the nature of electrostatic force between two charges?

Q. A point charge

q_{1}

exerts an electric force on a second point charge

q_{2}

. If a third charge

q_{3}

is brought near to

q_{2}

, the electrostatic force exerted by

q_{1}

q_{2}

will
(Presence of charges in the vicinity does not change the force between any two charges)

Q. Fill in the blank :

The mutual electrostatic force between two point charges

q_{1}

and

q_{2}

is _____ to the product of charges

q_{1}

and

q_{2}

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Charges $Q_{1}$ and $Q_{2}$ are in vacuum initially. $Q_{2}$ experiences a net force F due to the presence of $Q_{1}$ . They are now placed in a new medium of dielectric constant ε_rand the relative distance between them is maintained. The new net force experienced by $Q_{2}$ due to the presence of $Q_{1}$ is

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