Work out what would happen if a grounded pith ball came near the electroscope.  Draw where the charges would be.  Try this out, making sure the pith ball doesn’t touch the electroscope.         Now work out what would happen if the pith ball touched the electroscope.  Let the pith ball bounce against the electroscope, and then draw the charges to show why it acts differently (or should act differently) at this point.

1. An electrophorus is charged (as in electrostatics II). It briefly touches one terminal of a capacitor so that a positive charge, +Q, is put on the plate of the capacitor that is connected to the terminal. After the electrophorus is removed, we have; +Q Will any changes take place at other plate (on the right of the diagram)? If so, draw the charge on the following diagram and explain why it appears. Your explanation must include reasons for the sign of any charge that appears and it must say where these electrostatic charges come from. If nothing happens to the other plate then explain why not. +Q

Background: A group of physics students try to discover the scale of forces on the microscopic level by trying to find out how much charge is needed for one newton of force. 17.    Assuming that two charges of the same magnitude are separated by one meter, and have an attraction of one newton.  What is the amount of charge needed to create this situation   18.    How many elementary charges are needed to create this charge? 19.    If this amount of charge were held on one plate of a parallel plate capacitor, at 12 V, what would the capacitance be?     20.    How far apart would the plates have to be in order to create this capacitance?  The plates have an area of 0.004 m2.  Comment on the distance between the plates.

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