3 The strings that stand nearly straight up on the dome of a

3. The strings that stand nearly straight up on the dome of a van de Graaff generator when the motor is running begin to fall when the motor is turned off. Why? (First consider why the strings were standing up to begin with.)

Solution

When the Van de Graaff generator starts charging, it transfers the charge to the strings which is on the dome of a vande Graaf generator. because the strings are getting charged to the same potential, they try to repel each other. This is why the strings actually stands up.