Two air-filled balloons each have a mass of m = 3.9 g. Each balloon hangs from the same point by its own string of length L = 0.41 m. Each balloon is rubbed to give it a static charge. Both balloons are rubbed the same amount, so each balloon has the same unknown charge (q₁ = q₂). The hanging balloons push away until each makes an angle of θ = 16° with respect to the vertical.
Determine the magnitude of the charge, in coulombs, on either one of the balloons. Remember that each balloon has the same charge. (q₁ = q₂)