Solve the given question:
Question: A large electroscope is made with "leaves" that are78-cm-long wires with tiny 31g spheres at the ends. When charged, nearly all the charge resides on the spheres.
Part A: If the wires each make a 26o angle with the vertical , what total charge Q must have been applied to the electroscope? Ignore the mass of the wires.
Please explain your answer. I know substitution is involved so be sure to give a detailed explanation on that as well.