16.1.2 Observe and explain You again have two electroscopes situated near each o

Question

16.1.2 Observe and explain You again have two electroscopes situated near each other: one is charged, and the other is not. This time the leads of a neon lightbulb connect the electroscopes (you may need an extra wire connected to one of the bulb's leads). Fill in the table that follows. Experiment Use the bulb to connect a chargedThen charge both electro- electroscope and an uncharged electroscope. You observe a short flash of light when you first connect them. scopes and touch the neon bulb leads across the tops of the electroscopes. You observe no light. Explain using the language of V field electric potential). Why does the flash last just a short time interval? CHAPTER SIXTEEN DCCIRCuirs 16-1 02014 Pearson Education.

Explanation / Answer

When bulb is connected across two electroscopes (one charged and other uncharged), the current (charge) flows from charged to uncharged electroscope. This is because, charged electroscope is at higher potential than uncharged. This results in a finite potetial difference which causes current to flow. This flowing current lights up the bulb.

When two electroscopes are charged, they have equal potential. Thus, there is no potential difference between them and hence no current flows. This is the reason no light is observed in thebulb, as no current flows through it.

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