Part A

A small sphere with mass $2\mathrm{.}80g$ hangs by a thread between two large parallel vertical plates $5\mathrm{.}00cm$ apart $($ Figure $1).$ The plates are insulating and have uniform surface charge densities $+$ and $-.$ The charge on the What potential difference between the plates will cause the thread to assume an sphere is $q=6\mathrm{.}70{10}^{-6}C$ angle of $30\mathrm{.}0$ with the vertical?

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