Question

Figure represents a negatively charged gold leaf electroscope. Of the parts A, B, C, D and E, state whether they are an insulator or a conductor:

Answer 1

Hint: This is a gold leaf electroscope and, in this question, we need to identify the nature of its parts that are labelled from A to E. It is use two very thin layer gold leaf to detect the presence of charge in a body and the nature or the polarity of the charge that is present in the body that is to be tested.
Complete answer:
In the given figure

Part 'A' is Where we touch the material whose charge we need to find out, it transfers charges to the gold leaf so it is a conductor.
Part 'B' doesn't allow the charge to move to the vessel of the electroscope thus acts as an insulator.
Vessel 'C' is made of glass for proper visual and also it is made as an insulator so that there may not be in flow or induced charges
Rod 'D' transfers the charges from part 'A' to the leaf 'E' so it is a conducting rod.
Gold leaves 'E' are where the charges rest and are made from gold, it deflects in the presence of charges and it is made from gold so it is a conductor.

Note:
Gold leaf electroscope is a special type of electroscope that not only detects the presence of charge that is present in the object but also the polarity of the charge that is present. That is the reason for its heavy insulation around the connecting parts like 'B' and vessel 'C' in order to make sure that there is no leakage of static current and to make a proper conformational reading for the charges present.