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 :

• A. A, B and E are conductors while D and C are insulators
• B. B, D and E are conductors while A and C are insulators
• C. A, D and E are insulators while B and C are conductors
• D. A, D and E are conductors while B and C are insulators

Answer 1

The correct option is D A, D and E are conductors while B and C are insulators

An electroscope is a device for detecting, measuring and finding the nature of a charge. An electroscope consists of a large earthed jar marked as C. A metal rod D is fitted into the mouth of the jar with the help of the plug B. On top of the plug is the metal disc A where the contact is made for detecting the charge of objects. At the lower end of the metal rod a pair of thin leaves of gold or aluminium marked E is suspended.
In case of a negatively charged electroscope, the parts A, D and E are negatively charged and are conductors. The parts B and C do not possess any charge and are insulators.