As shown above, a charged particle \(A\) with mass \(m\) is placed between two parallel charged plates parallel to the ground with the negatively charged plate closer to the ground. The distance between the two plates is \(d\) and the electric potential difference between the two plates is \(V\). If the particle is stationary, then what is the magnitude of the quantity of the electric charge of \(A?\)
Note: \(g\) denotes the gravitational acceleration.
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