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Point charges q1 and q2 lie o the x-axis...

Point charges `q_1` and `q_2` lie o the x-axis at points `x=-a` and `x=+a` respectively.
a. How must `q_1` and `q_2` be related for the net electrostatic force on point charge `+Q`, placed at `x=+a/2, ` to be zero?
b. With the same point charge `+Q` now placed ate `x=+3a//2`

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