A large electroscope is made with \"leaves\" that are 70 cm long wires with 29 g

Question

A large electroscope is made with "leaves" that are 70 cm long wires with 29 g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 30

A large electroscope is made with "leaves" that are 70 cm long wires with 29 g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 30 degree angle with the vertical (Fig. 16-64), what total charge Q must have been applied to the electroscope? Ignore the mass of the wires.

Explanation / Answer

The wires form two sides of an equilateral triangle, and so the two

charges are separated by a distance d =70 cm and are directly

horizontal from each other. Thus the electric force on each charge is

horizontal. From the free-body diagram for one of the spheres, write the

net force in both the horizontal and vertical directions and solve for the

electric force. Then write the electric force by Coulomb

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