Question

A large electroscope is made with "leaves" that are 70 cm long wires with 22 g...

A large electroscope is made with "leaves" that are 70 cm long wires with 22 g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 30° angle with the vertical, what total charge Q (in µC) must have been applied to the electroscope? Ignore the mass of the wires.

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