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A charge + 10^-9 C is located at the or...

A charge ` + 10^-9 C` is located at the origin in free space `&` another charge ` Q` at ` (2,0,0)` . If the X-component of the electric field at (3,1,1) is zero , calculate the value of `Q`, Is the Y-component zero at (3,1,1) ?

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The correct Answer is:
`-0.46xx10^(-9)C`
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