A 0.021 g plastic bead hangs from a lightweight thread. Another bead is fixed in position beneath the point where the thread is tied. If both beads have charge q, the moveable bead swings out to the position shown in (Figure 1).

1. What is q? Express your answer with the appropriate units.

2. If we ignore the suspended charge on the string, and only consider the fixed charge q, what would the electric potential (V) be at the present location of the suspended charge? Assume the fixed charge behaves as a point charge. Hint: use the equation for the electric potential of a point charge: V=Kq/r where K = 9 x 10⁹ Nm²/C²

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