A large electroscope is made with leaves that are 78-cm-long wires with tiny 24-g spheres at the

Question:

A large electroscope is made with €œleaves€ that are 78-cm-long wires with tiny 24-g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 30o angle with the vertical (Fig. 16-64), what total charge must have been applied to the electroscope? Ignore the mass of the wires.