2. Capacity affected by (1) area, (2) induction.
3. Condensers, Leyden jar, parallel plate.
4. Oscillatory discharge, conditions, results.
Exercises
1. Is the air a conductor? Explain.
2. Can the Leyden jar be strongly charged if the outer coat is insulated? Explain.
3. Upon what two conditions does the capacity of a body depend? How in each case?
4. Would a lightning discharge produce wireless waves? Explain.
5. If a sharp tack be dropped point up on the plate of an electroscope the latter is quickly discharged. Explain.