An unknown charge is located at the origin and an electron is located at x =...

Question:

An unknown charge is located at the origin and an electron is located at x = +0.2 nm. If the net electric force on a small positive test charge is zero at x = -1.5 nm, what is the magnitude and sign of the unknown charge?
test charge q unknown charge Q electron x=-1.5 nm x=0 x=+0.2 nm

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