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A charge of 16xx10^(-9) C is fixed at th...

A charge of `16xx10^(-9) C` is fixed at the origin of coordinates. A second charge of unknow magnitude is at `x=3 m, y=0` and a third charge of `12xx10^(-9) C` is at x=6m, y=0. What is the value of the unknown charge if the resultant field at x=8m, y=0 is 20.25 N/C directed towards positive x-axis ?

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The correct Answer is:
`-25xx10^(-9) C`
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RESONANCE-ELECTROSTATICS-HLP
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