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What is the fractional error in g calcul...

What is the fractional error in g calculated from `T = 2 pi sqrt((l)/(g))` ? Given that fractional error in `T` and `l` are `pm x` and `pm y` respectively.

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The correct Answer is:
`(-1)/2 muC`
`(F_(Q))_("total")=|vec(F)_(Qq)+vec(F)_(Qq)+vec(F)_(qQ)|`
`O=2F_(q) cos 45^(@)+F_(Q)`
`O=2xx1/sqrt(2)xx(KQq)/a^(2)+(KQ^(2))/(2a^(2))`
`q=(-Q)/(2sqrt(2))=sqrt(2)/(2sqrt(2))=-1/2 mu C`
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