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A charge of -5.4X10^-7 exerts an upward .250 N force on an unknown charge .260m directly below it. What is the unknown charge?

  • physics -

    F=k•q₁•q₂/r²
    k =9•10⁹ N•m²/C²
    q₂ =F•r²/k •q₁

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