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A positive charge

`q`

is fixed at point

`(3,4)`

and a negative charge

`-q`

is fixed at point

`(3,0)`

. Determine the net electric force

`vec(F)_(nct )`

acting on a positive test charge

`+Q`

at the origin

`(0,0)`

in terms of the given quantities and the permittivity of free space

`\epsi lon_(0)`

. Enter your expression using

`j`

unit vector notation and rational coefficients.