Physics (Electric charge for charged rods)

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I need help with this question, please.

What is the direction of the force between (a) two particles whose charges are the same sign and (b) two particles of opposite sign? (c) What happens to the magnitude of the force when the distance between two particles is increased?
Answer a)towards each other or away of each other?
b)towards each other or away of each other?
c)increases, decreases, or stay the same?
Thank you.
Thank you

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