Important Topics
1. Positive and negative changes. Law of electric action.
2. Electroscope and its uses.
3. Conductors and insulators.
Exercises
1. Is air a conductor? Give reasons for your answer.
2. Mention two points of likeness and two points of difference between magnetism and electrification.
3. If you were testing the electrification of a body with a charged pith ball suspended by a silk thread, would attraction or repulsion be the better test? Give reasons.
4. Have you ever produced electrification by friction outside of a laboratory? Explain.