Activity 2
Aim: to observe the pattern of an electric field.
Materials: Cooking oil talcum powder
Apparatus: Extra High Tension (E.H.T) power supply(0-5 kV) electrodes with different shapes( pointed electrode and plane electrode), Petri dish, connecting wires
1.The apparatus is set up as shown in Finure 2.7. The talcum powder is sprinkled on top of the oil
2. The E.H.T power supply is switched and the voltage is adjusted to 4 kv.
3. The movement of the talcum powder and the field patterns are observed.
4. Steps 1 to 3 are repeated by using different arrangements of the electrodes as shown in Table 2.1.The patterns are also shown in the table.