practice

1. Write something.
2. Write something.
3. Write something.
4. Write something completely different.

conceptual

1. Explain how an object that is electrically neutral can be attracted to an object that is electrically charged.
2. Describe a procedure that could be used to determine the sign of the charge on an object.
3. You and three of your friends are playing golf on a seemingly fine afternoon when, of course, it begins to rain. A bolt of lightning strikes one of your friends who is motionless and unresponsive. When will your friend be "safe" enough to touch so that you can render first aid without electrocuting yourself?
4. Why should you touch your finger to the metal portions of the case of a computer before you open it to insert or replace parts? Why should you place empty fuel cans on the ground before filling them with gasoline, kerosene, diesel, etc.?
5. With the aid of diagrams, show the distribution of charges on an electroscope and the position of its leaves during the following experiment.
   1. Take an uncharged electroscope and place your finger on the terminal.
   2. Bring a negatively charged rod near the terminal.
   3. Move your finger and the charged rod away from the terminal at the same time. What is the charge on the electroscope?
   4. Repeat the procedure described above, but replace the negatively charged rod with one that is positively charged.
6. With the aid of diagrams, show the distribution of charges on two identical uncharged metal spheres in contact during the following experiment.
   1. Bring a negatively charged rod near one of the spheres on the side opposite the point of contact.
   2. Separate the two spheres and remove the rod. What charge does each sphere have?
   3. Touch the two spheres together. What charge does each have?
   4. Repeat the procedure described above, but replace the negatively charged rod with one that is positively charged.
7. With the aid of diagrams, show the distribution of charges on an electroscope and the position of its leaves for each of the following scenarios.

   Eight Experiments with an Electroscope
   	initial charge of electroscope	charge on rod	position of rod relative to terminal
   a.	uncharged	positive	in contact, then removed
   b.	uncharged	negative	in contact, then removed
   c.	uncharged	positive	near, but not in contact
   d.	uncharged	negative	near, but not in contact
   e.	positive	negative	near, but not in contact
   f.	negative	negative	near, but not in contact
   g.	positive	positive	near, but not in contact
   h.	negative	positive	near, but not in contact