take a negatively charged electroscope and explain how is it helpful in determining whether a body is positively or negatively charged
Answers
Explanation:
A charged body is brought near a positively charged gold leaf electroscope. The divergence of its leaves increases. If the same body is brought near a negatively charged gold-leaf electroscope, what will be the effect on the divergence of its leaves?
When uncharged rod is touched on the disc of a negatively charged gold leaf electroscope, the divergence between the gold leaves decreases as unlike charges attract each other. It is to be noted that a charged body can also attract an uncharged body, so repulsion is the sure test to determine whether the body is charged or not.
Therefore, when the uncharged rod is rolled on the disc of the negatively charged gold leaf electroscope, the electrons from the rod are transferred to the electroscope due to the negative charge and thus the rod becomes positively charged. Now the unlike charges attract each other and the divergence decreases.