1.

A charge q_1 exerts some force on a second charge q_2 If third charge q_3, is brought near, the force of q_1 exerted on q_2

Answer»

Decreases 
Increases 
Remains unchanged 
Increases if `q_3` is of the same SIGN as `q_1` and decreases if `q_3` is of opposite sign. 

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